This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Angle-Closure Glaucoma, Subject name: Ophthalmology
[{'content': 'What is the drug of choice for treating angle closure glaucoma? \nSelect and explain. \nA. Pilocarpine, B. Timolol, C. Dipiveffine, D. Apraclonidine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pilocarpine o Has been explained in previous sessions.", 'role': 'assistant'}]