This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Drug used in unstable angina to prevent Myocardial infarction is \nSelect and explain. \nA. Aspirin, B. GTN, C. Amlodipine, D. Fasudil', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Aspirin is an antiplatelet agent used mostly in unstable angina to prevent MI. Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]