Which vitamin is essential for metabolism of carbohydrate, fat, and protein and is necessary for tissue maintenance and healthy eyes?

Which vitamin is essential for metabolism of carbohydrate, fat, and protein and is necessary for tissue maintenance and healthy eyes?

• A. Thiamine
• B. Riboflavin
• C. Niacin
• D. Vitamin A

Answer: (B)

Vitamins often act as coenzymes that help enzymes carry out essential steps in energy production. Riboflavin, in particular, forms the coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN), which are involved in many oxidation–reduction reactions that convert carbohydrate, fat, and protein into usable energy. Beyond providing energy, riboflavin supports the health of various tissues, including the eyes and mucous membranes, so its role extends to tissue maintenance and eye health. Among the options, riboflavin best fits both parts of the statement: it is needed for metabolism of all three macronutrients and it supports tissue maintenance and healthy eyes. While other vitamins also aid metabolism of macronutrients or eye health, riboflavin uniquely aligns with both functions described.

Vitamins often act as coenzymes that help enzymes carry out essential steps in energy production. Riboflavin, in particular, forms the coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN), which are involved in many oxidation–reduction reactions that convert carbohydrate, fat, and protein into usable energy. Beyond providing energy, riboflavin supports the health of various tissues, including the eyes and mucous membranes, so its role extends to tissue maintenance and eye health. Among the options, riboflavin best fits both parts of the statement: it is needed for metabolism of all three macronutrients and it supports tissue maintenance and healthy eyes. While other vitamins also aid metabolism of macronutrients or eye health, riboflavin uniquely aligns with both functions described.