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
Glaucoma drug which is b-1 selectve p-blocker is ? 
Select and explain. 
A. Timolol, B. Laevobuno I ol, C. Caeolol, D. Betaxolol
D: Betaxolol
Answer: D: Betaxolol 
Explanation: Ans. is 'd' i.e., Betaxolol o Among the given options, only betaxolol is 0-1 selective.