This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute coronary syndrome, Subject name: Medicine
[{'content': 'All of the following are used for secondary prevention of MI except? \nSelect and explain. \nA. Aspirin, B. Statins, C. Beta-blockers, D. Warfarin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aspirin and clopidogrel have been shown to reduce moality due to MI. Statins regress atherosclerosis and b blockers which have an oxygen conserving action will prevent future episode of MI. Warfarin is not routinely used in post-MI patients.', 'role': 'assistant'}]