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': 'Drug of choice for treatment of Acute attack of primary Angle Closure glaucoma is \nSelect and explain. \nA. Mannitol, B. Latanoprost, C. Pilocarpine, D. Acetazolamide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]