This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
[{'content': 'Rare limiting step in cholesterol synthesis is \nSelect and explain. \nA. HMG CoA synthetase, B. HMG CoA lyase, C. HMG CoA reductase, D. Mevalonate synthetase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Repeated question', 'role': 'assistant'}]