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
[{'content': 'Mechanism of action of beta blokers in glaucoma? \nSelect and explain. \nA. Increased aqueous outflow, B. Decreased aqueous production, C. Opening of trabecular meshwork, D. All of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Decreased aqueous production", 'role': 'assistant'}]