This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
[{'content': 'Sterols are metabolized to \nSelect and explain. \nA. Coenzyme A, B. VIt A, C. Vit D, D. Vit E', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vitamin D is derived from 7-dehydrocholesterol by the action of UV radiations 7 dehydrocholesterol, an intermediate of a minor pathway of cholesterol synthesis The cis double bond is isomerized to a trans double bond to give rise to vitamin D3 or cholecalciferol Ref: DM Vasudevan, 7th edition, page no: 469', 'role': 'assistant'}]