Question

Identify the correct statement related to stress and its impact on immune system:
A. Stress can cause illness by impairing the function of the immune system.
B. Stress can affect natural killer cell cytotoxicity.
C. Stress hormones weaken the immune system and thereby affect mental and physical health.
D. Optimal Stress always enhances the functioning of immune system.
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, B and C only
• C. A, C and D only
• D. A, B, C and D

Hint:

A, B and C are true and D is false, so option (2).

Answer 1

The Correct Option is B

Step 1: Look for the extreme word.
Statement D says optimal stress always improves immunity. Such absolute words are usually a sign of a wrong statement.

Step 2: Test A, B and C with facts.
Chronic stress is linked with more infections and slower healing, which supports A. Lower natural killer cell activity is a well known finding under stress, which supports B. High cortisol and other stress hormones dampen immune response and harm health, which supports C.

Step 3: Decide on D.
Short bursts of mild stress can raise some immune activity, but it is not true in every case, so the word always makes D incorrect.

Step 4: Use the option pattern.
Options (1), (3) and (4) each contain D. As D is false, they cannot be right.

Step 5: Select.
Only option (2), A, B and C only, is left.

Final Answer:
A, B and C are true and D is false, so option (2).