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
A patient came to the casualty with acute bronchial asthma after treatment of glaucoma. The probable drug may be 
Select and explain. 
A. Timolol, B. Betaxolol, C. Latanoprost, D. Anticholinesterase
A: Timolol
Answer: A: Timolol 
Explanation: Timolol is a non selective β blocker (act on β1& β2 ). β2 blocking effect of Timolol cause blockage of dilator β2 receptor so it can precipitate asthma. Whereas Betaxolol is cardioselective beta blocker that acts only on β2  receptor.