This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'The alpha 2 agonist used in glaucoma is \nSelect and explain. \nA. Guanacare, B. Guanabenz, C. Brimonidine, D. Tizanidine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref: KD Tripathi pharmacology 7th edition (page.no: 153) a2 agonist used for glaucoma is Brimonidine, Apraclonidine. Drugs used for glaucoma - b blocker; Timolol,Betaxolol PG analogue ; Latanoprost ,Bimatoprost Carbonic anhydrase inhibitors ; acetazolamide ,Dorzolamide Miotics; Pilocarpine', 'role': 'assistant'}]