What do you Understand by Vitamin A Functions

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All of the following statements concerning vitamin A functions are true EXCEPT:

a) Transmission of light stimuli to the brain, via combination with a specific protein, opsin, to form a visual pigment, rhodopsin, in the retina of the eye

b) Regulation of cell growth and differentiation in epithelium, connective tissues (including bone and cartilage) and hematopoietic tissues by retinoic acid, a highly bioactive metabolite of retinol

c) Retinoic acid is especially important during embryogenesis

d) Acts as a hormone involved in regulation of calcium and phosphorus homeostasis

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