Match List-I with List-II.

Choose the correct answer from the options given below :

List-I contains the names of water-soluble vitamins, whereas List-II lists the important coenzymes (or biological roles) derived from / associated with them.

Case A (Riboflavin - Vitamin B2)
• Riboflavin is converted in the body into the flavin coenzymes FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide).
• Therefore A matches with II  ⟹  A → II.

Case B (Niacin / Nicotinic acid - Vitamin B3)
• Niacin gives the coenzymes NAD+ and NADP+, which are traditionally called Coenzyme I and Coenzyme II in older biochemical literature.
• Hence B matches with I  ⟹  B → I.

Case C (Pyridoxine - Vitamin B6)
• The active coenzyme form of vitamin B6 is pyridoxal-5-phosphate (PLP), required for transamination and other amino-acid reactions.
• Thus C matches with IV  ⟹  C → IV.

Case D (Ascorbic acid - Vitamin C)
• Vitamin C is needed for the hydroxylation of proline and lysine during collagen synthesis; its deficiency causes scurvy.
• So D matches with III  ⟹  D → III.

Collecting all four matches:
A → II, B → I, C → IV, D → III.

This arrangement is given only in Option A.

Final Answer: Option A which is: A-II, B-I, C-IV, D-III