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: Biochemistry
[{'content': 'Which of the following is a component of the visual pigment rhodopsin: \nSelect and explain. \nA. 13-Carotene, B. Retinal, C. Retinol, D. Retinoic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Retinal', 'role': 'assistant'}]