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 Co A in the liver is: \nSelect and explain. \nA. Mevalonate, B. HMG CoA, C. Acetoacetyl CoA, D. 3-hydroxy-butyryl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. HMG CoA', 'role': 'assistant'}]