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': 'Beta 1 antagonist used in congestive cardiac failure ? \nSelect and explain. \nA. Atenolol, B. Metoprolol, C. Salbutamol, D. Terbutaline', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Metoprolol b-blockers used in CHF Cardioselective b-blockers (b1-blockers) Atenolol Bisoprolol Celiprolol Esmolol Metoprolol Nebivolol Acebutalol Betoxalol Non-selective blocker with a-blocking acting Carvedilol Dilovalol Medroxalol Bucindolol Labetalol Bevantolol Nipradilol Among all these following three are used most commonly Carvedilol Metoprolol Bisoprolol", 'role': 'assistant'}]