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 reaction which requires HMG–COA reductase activity \nSelect and explain. \nA. β-hydroxy–β-methyl glutaryl COA → Mevalonic acid, B. Acetyl COA + CO2 + ATP → Malonyl COA + ADP+ Pi, C. L-methylmalonyl-CoA Succinyl COA, D. Lactose + H2O → Glucose + Galactose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]