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
The alpha 2 agonist used in glaucoma is 
Select and explain. 
A. Guanacare, B. Guanabenz, C. Brimonidine, D. Tizanidine
C: Brimonidine
Answer: C: Brimonidine 
Explanation: 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