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
Mechanism of action of beta blokers in glaucoma? 
Select and explain. 
A. Increased aqueous outflow, B. Decreased aqueous production, C. Opening of trabecular meshwork, D. All of the above
B: Decreased aqueous production
Answer: B: Decreased aqueous production 
Explanation: Ans. is 'b' i.e., Decreased aqueous production