Which one is photosensitive in mammals?

The correct option is B Rhodopsin

A. Retinol is vitamin A which has many health benefits.

B. Rhodopsin is photopigment present in rods of retina. It is derivative of vitamin A and associated with scotopic vision i.e. vision under low light or dim light.

C. Melanin is a pigment responsible for darkening of skin of humans.

D. Sclerotin is a structural protein that forms cuticle of insects.

Hence, rhodopsin is photosensitive pigment in mammals.

So, the correct answer is 'Rhodopsin'.