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': 'Which of the following drug is used in MI? \nSelect and explain. \nA. Cocaine, B. Pethidine, C. Morphine, D. Butrophanol', 'role': 'user'}, {'content': "Answer: C \nExplanation: Morphine - an opioid- relieves severe pain in MI thereby decreasing patient's apprehension no other painkiller is suitable for MI REF: KD Tripathi 8th ed", 'role': 'assistant'}]