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': 'Earliest drug used in acute angle closure glaucoma \nSelect and explain. \nA. Diamox, B. Pilocarpine, C. Atropine, D. DFP', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e Diamox (Acetazolamide) As already explained in Nov 99, Acetazolamide is used even earlier than Pilocarpine.", 'role': 'assistant'}]