This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
[{'content': 'Which of the following is a component of the visual pigment rhodopsin? \nSelect and explain. \nA. b-Carotene, B. Retinal, C. Ret, D. Retinoic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Retinal is a component of visual pigment rhodopsin. Rhodopsin (mol. wt. 35,000 Daltons) plays the pivotal role in vision. It is a membrane protein found in the photoreceptor cells of the retina. Rhodopsin is made up of the protein opsin and 11-cis-retinal. Ref: DM Vasudevan - Textbook of Biochemistry, 8th edition, page no: 455', 'role': 'assistant'}]