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': 'Drug used in glaucoma is – \nSelect and explain. \nA. Propranolol, B. Atenolol, C. Timolol, D. Pindolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Topical β-blockers used for POAG are Timolol, betaxolol, levobunolol, carteolol.', 'role': 'assistant'}]