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
Which antiglaucoma drug can be used in an asthmatic patient ? 
Select and explain. 
A. Timolol, B. Betaxolol, C. Propranolol, D. All
B: Betaxolol
Answer: B: Betaxolol 
Explanation: None