Which vitamin is notably sensitive to light and should be protected from light during handling?

• A. Vitamin A
• B. Vitamin C
• C. Vitamin D
• D. Vitamin K

Answer: (A)

Light can break down some vitamins, and this test is about that photolability. Vitamin A is notably sensitive to light; exposure to light can initiate oxidation and chemical changes in retinol, turning it into less active forms and reducing potency. To keep it effective, handle and store Vitamin A under light-protective conditions—use amber bottles or wrap in foil and avoid exposing it to sunlight or bright artificial light. This is why Vitamin A is the best choice for protection from light during handling.