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
Myocardial re-infarction inhibitor 
Select and explain. 
A. Beta blockers, B. Nitrates, C. Calcium channel blockers, D. Potassium channel openers
A: Beta blockers
Answer: A: Beta blockers 
Explanation: 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.