248.First clinical sign of Vitamin A deficiency

a.corneal xerosis
b.conjuctival xerosis
c.Bitot's spots
d.Night blindness

Ans-b.conjuctival xerosis

Explanation-ref park 18th ed pg 443

71.The vitamin that can be synthesized by microorganisms only:

1. Cobalamine.2. Folic acid.

3. Niacin. 4. None.

ANS. 1

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