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': 'Drug useful in acute M.I.are all except - \nSelect and explain. \nA. Nifedepine, B. Aspirin, C. ACE inhibitors, D. Metoprolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]