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: Pharmacology
[{'content': 'All of the following agents are used in glaucoma treatment, except: \nSelect and explain. \nA. Apraclonidine, B. Timolol, C. Pilocarpine, D. Metoprolol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: - Drugs used in Glaucoma\n\nMiotics- Pilocarpine, Physostigmine, Echothiophate\nBeta-blockers - Timolol, levobunolol, Carteolol, betaxolol\nPGF2α\xa0analogs - Latanoprost, bimatoprost, travoprost\nAlpha 2 agonist- Apraclonidine, brimonidine\nAlpha 1 agonist- Dipivefrine, adrenaline\nCarbonic anhydrase inhibitors- Dorzolamide, brinzolamide\n\n- Metoprolol, though a beta blocker is not used for glaucoma because of its local anaesthetic property. Drugs having local anaesthetic property will increase the risk of corneal ulcers.', 'role': 'assistant'}]