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 immediate precursor in the formation of acetoacetate from acetyl CoA in the liver is \nSelect and explain. \nA. Mevalonate, B. HMG CoA, C. Acetoacetyl CoA, D. 3-Hydroxybutyryl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HMG CoA\xa0\n\n\nAcetoacetyl-CoA is the starting material for ketogenesis.\n\n\n\nHowever, it is HMG-CoA from which acetoacetate arises.', 'role': 'assistant'}]