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': 'Topical beta blocker is the drug of choice of – \nSelect and explain. \nA. Angle closure glaucoma, B. Open angle glaucoma, C. Hypopyon corneal ulcer, D. Acute granulomatous uveitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]