Question:medium

Find the odd one out: Heart, Lungs, Kidney, Skin, Liver

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When all items look similar, look for “inside vs. outside”, “living vs. non-living”, or a different system/function.
Updated On: Jul 15, 2026
  • Skin
  • Lungs
  • Heart
  • Kidney
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The Correct Option is A

Approach Solution - 1

Group the organs by location first: Heart, Lungs, Kidney and Liver all sit inside the body's cavities, chest or abdomen, and are never exposed to the outside world directly.

Now place Skin in this grouping: Skin covers the entire outside of the body and is the only one of the five in direct, constant contact with the external environment; it works by covering and protecting, not by processing blood or air internally.

Because Skin sits outside the body while the other four sit inside it, Skin is the one that does not share the internal-organ category.
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Approach Solution -2

Another way to separate these organs is to ask whether each one directly processes blood as its main job. Let's check each option on this basis:

  1. Skin: While skin does contain blood vessels for temperature regulation, its main functions are protection, sensation, and controlling body temperature, it does not filter, pump, or chemically process blood as its primary role.
  2. Lungs: The lungs take blood arriving from the heart and directly exchange gases with it, adding oxygen and removing carbon dioxide, a direct blood-processing role.
  3. Heart: The heart's entire function is to pump blood around the body, making it the central engine of blood circulation, a direct blood-processing role.
  4. Kidney: The kidneys filter blood continuously to remove waste and form urine, another direct blood-processing role.

Lungs, Heart, and Kidney, along with Liver, which detoxifies and processes substances carried in the blood, all have blood processing as a core, direct function. Skin's role is protective and sensory rather than processing blood, setting it apart from the other four.

Therefore, the correct answer is Skin.

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Top Questions on Classification

Questions Asked in CLAT exam

Read the passage and answer the question.

Passage (extract): The work which Gandhiji had taken up was not only regarding the achievement of political freedom but also the establishment of a new social order based on truth and non-violence, unity and peace, equality and universal brotherhood and maximum freedom for all. A new order cannot be established without radically changing the mind and attitude of men towards property and, at some stage or the other, the 'haves' have to yield place to the 'have-nots'. We have seen, in our time, attempts to achieve a kind of egalitarian society and the picture of it after it was achieved. But this was done, by and large, through the use of physical force. It may even be that, like a gas kept confined within containers under great pressure, or water held back by a big dam, once the barrier breaks, the reaction will one day sweep back with a violence equal in extent and intensity to what was used to establish and maintain the outward egalitarian form. This enforced egalitarianism contains, in its bosom, the seed of its own destruction. If egalitarianism is to endure, it has to be based not on the possession of the maximum material goods by a few or by all but on voluntary, enlightened renunciation of those goods which cannot be shared by others or can be enjoyed only at the expense of others.

According to the passage, egalitarianism will not survive if
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Read the passage and answer the question.

Passage (extract): The work which Gandhiji had taken up was not only regarding the achievement of political freedom but also the establishment of a new social order based on truth and non-violence, unity and peace, equality and universal brotherhood and maximum freedom for all. This unfinished part of his experiment was perhaps even more difficult to achieve than the achievement of political freedom. In the political struggle, the fight was against a foreign power and all one could do was either join it or wish it success and give it his/her moral support. In establishing a social order on this pattern, there was a strong possibility of a conflict arising between diverse groups and classes of our own people.

According to the passage, which was the unfinished part of Gandhi's experiment?
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Read the passage and answer the question.

Passage (extract): In the political struggle, the fight was against a foreign power and all one could do was either join it or wish it success and give it his/her moral support. Experience shows that man values his possessions even more than his life because in the former he sees the means for perpetuation and survival of his descendants even after his body is reduced to ashes. We have seen, in our time, attempts to achieve a kind of egalitarian society and the picture of it after it was achieved. But this was done, by and large, through the use of physical force. This enforced egalitarianism contains, in its bosom, the seed of its own destruction. The root cause of class conflict is possessiveness or the acquisitive instinct.

Which of the following statements is 'not true' in the context of the passage?
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