It is a group of unsaturated nutritional organic compounds that includes retinol retinal retinoic ac...........

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It is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin carotenoids. It is important for growth and development, for the maintenance of the immune system, and for good vision.

Which of the following vitamin is being described in the passage given above?

Vitamin A

Vitamin B

Vitamin C

Vitamin D

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Explanation:

Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision. Vitamin A also functions in a very different role as retinoic acid (an irreversibly oxidized form of retinol), which is an important hormone-like growth factor for epithelial and other cells. The retinol form functions as a storage form of the vitamin, and can be converted to and from its visually active aldehyde form, retinal.