Match the vitamins in List I with their sources in List II
Choose the correct answer from the options given below:
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An excellent rule of thumb for biochemistry questions involving vitamins is remembering specific exclusive facts: Vitamin $\text{B}_{12}$ is never inherently found in plant sources. Hence, it must pair with animal-derived options like meat (B-I). Matching this immediately rules out options (1), (2), and (4) in this question, leading you directly to the correct option (3) without any ambiguity!
Step 1: Frame the task. We match each vitamin to its richest dietary source. Step 2: Vitamin A. Vitamin A (retinol) comes from its precursor beta-carotene, which is abundant in carrots. So A matches IV. Step 3: Vitamin B12. Vitamin B12 is made only by bacteria and is found almost entirely in animal foods, so its source here is meat. So B matches I. Step 4: Vitamin E. Vitamin E (tocopherol) is a fat-soluble antioxidant concentrated in plant oils, seeds and nuts; here sunflower oil is the source. So C matches II. Step 5: Vitamin K. Vitamin K is made in green photosynthetic tissue, so its main source is green leafy vegetables. So D matches III. Step 6: Combine the pairs. A-IV, B-I, C-II, D-III, which is option (3). \[ \boxed{\text{A-IV, B-I, C-II, D-III}} \]
