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
Earliest drug used in acute angle closure glaucoma 
Select and explain. 
A. Diamox, B. Pilocarpine, C. Atropine, D. DFP
A: Diamox
Answer: A: Diamox 
Explanation: Ans. is 'a' i.e Diamox (Acetazolamide) As already explained in Nov 99, Acetazolamide is used even earlier than Pilocarpine.