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
Receptor responsible for decrease in aqueous humor formation: 
Select and explain. 
A. Beta 1, B. Alpha 2, C. M2, D. Beta 2
B: Alpha 2
Answer: B: Alpha 2 
Explanation: 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