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: Pharmacology
[{'content': 'A 50 year old man had an attack of myocardial infarction and developed ventricular ectopics and low ejection fraction. Which of the following antiarrhythmic drug to be given - \nSelect and explain. \nA. Flecainide, B. Mexilitine, C. Beta-blocker, D. Radio-frequency ablation technique', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Beta-blockers "Beta-adrenoreceptor blocking agents are effective in abolishing ventricular ectopic activity in patients with acute MI .""Because of concerns about worsening arrhythmia and sudden death with most antiarrhythmic agents, beta- blockers are the agent of choice".', 'role': 'assistant'}]