This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, Subject name: Medicine
[{'content': 'Drug contraindicated in an asthmatic female for treatment for glaucoma - \nSelect and explain. \nA. Prostaglandin, B. Timolol, C. Apraclanidine, D. Bromonidine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Timolol o As you all know b2 receptors cause bronchodilatation, blockade of b2, mediated bronchodilatation can precipitate bronchospasm and acute attack of asthma.o Timolol is a non-selective b-blocker (blocks b1 and b2 receptors). Therefore, it can precipitate acute attack of asthma.", 'role': 'assistant'}]