This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., 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 CHF1. Cardioselective b-blockers (b-blockers)o Atenololo Bisoprololo Celiprololo Esmololo Metoprololo Nebivololo Acebutalolo Betoxalol2. Non-selective b-blocker with a-blocking actingo Carvedilolo Dilovalolo Medroxalolo BucindololoLabetalolo Bevantololo Nipradilol o Among all these following three are used most commonly -CarvedilolMetoprololBisoprolol