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
Which antiglaucoma drug decreases aqueous formation- 
Select and explain. 
A. Prostaglandins, B. Beta - blockers, C. Mannitol, D. Pilocarpine
B: Beta - blockers
Answer: B: Beta - blockers 
Explanation: drug which decreases aqueous production timolol or other betablocker, or brimonidine or dorzolamide Ref.AK Khurana 4th edition page no 223