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
[{'content': 'Which of the following drugs is not used topically for treatment of open angle glaucoma - \nSelect and explain. \nA. Latanoprost, B. Brimonidine, C. Acetazolamide, D. Dorzolamide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]