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
[{'content': 'A patient came to the casualty with acute bronchial asthma after treatment of glaucoma. The probable drug may be \nSelect and explain. \nA. Timolol, B. Betaxolol, C. Latanoprost, D. Anticholinesterase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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\xa0on\xa0β2\xa0\xa0receptor.', 'role': 'assistant'}]