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
Macular edema is caused by all except: 
Select and explain. 
A. Microaneurysm, B. Cap dilatation, C. Neovascularization, D. None
D: None
Answer: D: None 
Explanation: D i.e. None