This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
A patient came to the casualty with acute bronchial asthma after treatment of glaucoma. The probable drug is: 
Select and explain. 
A. Timolol, B. Betaxolol, C. Latanoprost, D. Anticholiriesterase
A: Timolol
Answer: A: Timolol 
Explanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 145,152) KDT 6/e p139 Timolol is a nonselective b blocker (act on b1& b2 ). b2 blocking effect of Timolol cause blockage of dilator b2 receptors. so it precipitates asthma. Other drugs used for glaucoma are- Betaxolol, a agonist ; Apraclonidine,Brimonidine PG analogue ; Latanoprost ,Bimatoprost, Carbonic anhydrase inhibitors ; acetazolamide ,Dorzolamide, Miotics; Pilocarpine