This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Which of the following drugs is not used topically for treatment of open angle glaucoma - 
Select and explain. 
A. Latanoprost, B. Brimonidine, C. Acetazolamide, D. Dorzolamide
C: Acetazolamide
Answer: C: Acetazolamide 
Explanation: Acetazolamide and Methazolamide are not recommended for long term use because of their side effects. However,acetazolamide 250mg tds may be added to control IOP for sho term. Ref :Ophthalmology A K Khurana 6th edition chapter-10 page no :237