This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Melanopsin is present in 
Select and explain. 
A. Cones, B. Rods, C. Amacrine cell, D. Ganglion cells
D: Ganglion cells
Answer: D: Ganglion cells 
Explanation: Ganglion cells that mediate pupillary constriction and circadian rhythms are light sensitive, owing to a novel visual pigment, melanopsin.