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
[{'content': 'Initiation of visual impulse is associated with \nSelect and explain. \nA. Condensation of opsin with vitamin A aldehyde, B. Photoisomerization and hydrolysis of visual purple, C. | NADP, D. | NAD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]