A vitamin that functions both as a hormone and a visual pigmen?

 A. Riboflavin

B. Folic acid

C. Thiamine

D.  Retinol/ Retinal


Solution: D

Retinol acts as a vitamin hormone as well as a visual pigment.

The scientific name of vitamin A is retinol. Night blindness is caused by deficiency of vitamin A.

Vitamin A exists in three oxidation states: Retinal, Retinol and Retinoic Acid (Retin A).

Hence, (d) is the correct answer.


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