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: Ophthalmology
Main MOA brimonidine in glaucoma ? 
Select and explain. 
A. Decreased aqueous secretion, B. Increased trabecular outflow, C. Increased uveoscleral outflow, D. Reduce vitreous volume
A: Decreased aqueous secretion
Answer: A: Decreased aqueous secretion 
Explanation: Ans. is 'a' i.e., Decreased aqueous secretion