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: Medicine
[{'content': 'Long-term secondary prevention following myocardial infarction is recommended with which one of the following drugs - \nSelect and explain. \nA. Antiplatelet drugs, B. Nitrates, C. Amiodarone, D. Calcium channel antagonist', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]