This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Receptor responsible for decrease in aqueous humor formation: \nSelect and explain. \nA. Beta 1, B. Alpha 2, C. M2, D. Beta 2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Alpha 2Stimulation of alpha 2 present on ciliary muscle helps in reduction of aqueous humor. This mechanism is utilized in treatment of glaucoma by apraclonidine, brimonidine. Answer is B', 'role': 'assistant'}]