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
Drug used in glaucoma is – 
Select and explain. 
A. Propranolol, B. Atenolol, C. Timolol, D. Pindolol
C: Timolol
Answer: C: Timolol 
Explanation: Topical β-blockers used for POAG are Timolol, betaxolol, levobunolol, carteolol.