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': 'Statin action on HMG CoA reductase is \nSelect and explain. \nA. Competitive inhibitor, B. Irreversible inhibitor, C. Non competitive inhibitor, D. Inhibition result in decrease LDL receptors on hepatocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]