This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Initiation of visual impulse is associated with 
Select and explain. 
A. Condensation of opsin with vitamin A aldehyde, B. Photoisomerization and hydrolysis of visual purple, C. | NADP, D. | NAD
B: Photoisomerization and hydrolysis of visual purple
Answer: B: Photoisomerization and hydrolysis of visual purple 
Explanation: Ans. (b) Photoisomerization and hydrolysis of visual purple(Ref: Ganong, 25th ed/p. 179)On exposure to light, there is conversion of 11 cis retinal to All trans retinal (photoisomerization) and hydrolysis of visual pigment