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
Selective beta 2 blocker is - 
Select and explain. 
A. Butoxamine, B. Betoxolol, C. Esmolol, D. Bisoprolol
A: Butoxamine
Answer: A: Butoxamine 
Explanation: 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