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': 'Most important drug used in the treatment of coronary artery disease is \nSelect and explain. \nA. Aspirin, B. Digoxin, C. Streptokinase, D. Nifedipine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]