Question: An early sign of retinol deficiencies in man is [A]. night blindness [B]. keratinization [C]. xeropthalmia [D]. none of these Answer: Option A Explanation: No answer description available for this question.

Question: Ascorbic acid acts as an [A]. reducing agent [B]. oxidizing agent [C]. oxidizing and reducing agent both [D]. none of the above Answer: Option A Explanation: No answer description available for this question.

Question: Who discovered vitamin C (ascorbic acid)? [A]. Paul Berg [B]. Linus Pauling [C]. Albert Szent-Gyorgyi [D]. Kerry Mull is Answer: Option C Explanation: No answer description available for this question.