This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Beta oxidation of fatty acids, Subject name: Biochemistry
Immediate precursor of acetoacetate: 
Select and explain. 
A. HMG CoA, B. Acetoacetyl CoA, C. Acetyl CoA, D. Malonyl CoA
A: HMG CoA
Answer: A: HMG CoA 
Explanation: Immediate precursor of acetoacetate (ketone body) is HMG CoA, not Acetoacetyl CoA. Ketone body synthesis