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 of choice to relieve pain in myocardial infarction- \nSelect and explain. \nA. Morphine, B. Fortwin, C. Diazepam, D. NSAID', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]