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
Beta 1 antagonist used in congestive cardiac failure ? 
Select and explain. 
A. Atenolol, B. Metoprolol, C. Salbutamol, D. Terbutaline
B: Metoprolol
Answer: B: Metoprolol 
Explanation: 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