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': 'Hypolipidemic agents act on: \nSelect and explain. \nA. HMG CoA synthetase, B. HMG CoA oxygenase, C. HMG CoA reductase, D. HMG CoA hydratase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. HMG COA reductase', 'role': 'assistant'}]