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': '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: Pharmacological agents used for POAG\nA) Topical drugs\n\nβ-blockers :- Timolol, betaxolol, levobunolol, carteolol.\nProstaglandin analogues :- Latanoprost, bimatoprost, travoprost.\nAlpha agonists :- Non-selective (epipherine, dipivefrine); selective a2 (Apraclonidine, Brimonidine).\nCarbonic anhydrase inhibitors :- Dorzolamide, brinzolamide.\nCholinomimetic agents :- Pilocarpine, physostigmine, echothiophate, carbachol.\n\nB) Systemic drugs\n\nCarbonic anhydrase inhibitors :- Acetazolamide, dichlorphenamide, methazolamide.\nHyperosmotic agents :- Mannitol, glycerol.', 'role': 'assistant'}]