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
[{'content': 'Selective beta 2 blocker is - \nSelect and explain. \nA. Butoxamine, B. Betoxolol, C. Esmolol, D. Bisoprolol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Butoxamine Selective b1 blockers are (cardioselective)1. Atenolol3. Bisoprolol5. Celiprolol7. Metoprolol2. Acebutalol4. Betoxolol6. Esmolol8. Nebivololo These agents are preferred in DM, hyperlipidemia, PVD, asthma.Selective (b2Butoxamine", 'role': 'assistant'}]