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': 'The principal precursor of cholesterol is - \nSelect and explain. \nA. Citrate, B. Acetate, C. Glycerol, D. Lanosterol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acetate\n\nAll carbon atoms of cholesterol are derived from acetyl-CoA (activated acetate).\n\n"Cholesterol is a C-27 compound. All its carbon atoms are provided by a single precursor, acetate".\xa0— Essential of biochemistry', 'role': 'assistant'}]