This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Light conves retinene to: \nSelect and explain. \nA. 11 cis, B. 11 trans, C. 13 cis, D. 13 trans', 'role': 'user'}, {'content': "Answer: B \nExplanation: In the dark, the retinene1 in rhodopsin is in the 11-cis configuration. The only action of light is to change the shape of the retinene, conveing it to the all-trans isomer. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 12.", 'role': 'assistant'}]