This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
A patient came to the casualty with acute bronchial asthma after treatment for glaucoma. The probable drug may be: 
Select and explain. 
A. Timolol, B. Betaxolol, C. Latanoprost, D. Anticholinesterase
A: Timolol
Answer: A: Timolol 
Explanation: Ans. (A) Timolol(Ref KDT 8th/e p167)Timolol is a non-selective beta blocker and can precipitate acute attacks of asthma in a susceptible individual via blockade of b2 receptors. Betaxolol is a cardioselective beta blocker and is less likely to cause this adverse effect.