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: Ophthalmology
[{'content': 'A patient of glaucoma with bronchial asthma presents to the emergency with status asthmaticus, causative agent might have been – \nSelect and explain. \nA. Pilocarpine eye drop, B. Timolol eye drop, C. Betaxolol eye drop, D. Levobunolol eye drop', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pilocarpine and timolol (β - blockers) can cause bronchospasm. However, β-blockers are the most commonly used drugs for POAG and pilocarpine is used very rarely these days. So, best answer here is timolol.', 'role': 'assistant'}]