This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Which of the following is a selective Beta 2 antagonist? 
Select and explain. 
A. Esmolol, B. Betaxolol, C. Butoxamine, D. Celiprolol
C: Butoxamine
Answer: C: Butoxamine 
Explanation: Esmolol, Betaxolol, Celiprolol are cardioselective beta 1 blockers. Butoxamine is a selective beta 2 blocker. From essential of medical pharmacology K D Tripathi 7th edition page no 144