Answer: The correct answer is A) Vitamin A.
Vitamin A is a fat soluble vitamin that plays significant role in normal vision as well as development of the body cells.
Vitamin A is also called retinol because it produces a light absorbing pigment in the retina that is called rhodopsin ( formed by combining retinal and opsin). This pigment is essential for both color vision as well as vision in the dim light ( scotopic).
This vitamin also functions as retinoic acid ( produced by oxidation of retinol) that is considered as a hormone like growth factor for epithelial and several other types of cells present in the body.
Thus, option A) is the right answer.
