This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Which antiglaucoma drug decreases aqueous formation- \nSelect and explain. \nA. Prostaglandins, B. Beta - blockers, C. Mannitol, D. Pilocarpine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: drug which decreases aqueous production timolol or other betablocker, or brimonidine or dorzolamide Ref.AK Khurana 4th edition page no 223', 'role': 'assistant'}]