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
[{'content': 'Which of the following is a selective Beta 2 antagonist? \nSelect and explain. \nA. Esmolol, B. Betaxolol, C. Butoxamine, D. Celiprolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]