This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Glaucoma drug which is b-1 selectve p-blocker is ? \nSelect and explain. \nA. Timolol, B. Laevobuno I ol, C. Caeolol, D. Betaxolol', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Betaxolol o Among the given options, only betaxolol is 0-1 selective.", 'role': 'assistant'}]