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': 'Myocardial re-infarction inhibitor \nSelect and explain. \nA. Beta blockers, B. Nitrates, C. Calcium channel blockers, D. Potassium channel openers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Beta-blockers when given in MI, prevent arrhythmias and also reinfarction.Hence they. increase the morbidity and decrease the moality . patient when discharged is put on beta blockers. REF: KD Tripathi 8th ed.', 'role': 'assistant'}]