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
Iris cysts are prevented by 
Select and explain. 
A. Atropine, B. Pilocarpine, C. Phenylephrine, D. Ecothiopate
C: Phenylephrine
Answer: C: Phenylephrine 
Explanation: C i.e. Phenylephrine