Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements.
I. Vitamin-A derivatives are formed from carotene.
I. The photopigments are embedded in the membrane discs of the inner segment.
III. Retinal is a derivative of vitamin-A.
IV. Retinal is a light absorbing part of all the visual photopigments.
(a) (I) and (II)
(b) (I), (III) and (IV)
(c) (I) and (III)
(d) (II), (III) and (IV)