A) retinol
B) thiamine
C) ascorbic acid
D) calciferol
Correct Answer: A
Solution :
Keratinisation of skin is prevented by vitamin-A (retinol). Its deficiency causes keratomalasia. (dryness and scaly skin due to deposition of keratin). In this disease cells of lacrimal glands become keratinised and stop secreting tears. Ascorbic acid (vitamin-C) is essential to form bone matrix and dentine. Calciferol (vitamin-D) is involved in absorption and retention of calcium and phosphate. Whereas thiamine (vitamin-B) prevent pellagra, beri-beri diseases.
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