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
In cystoid macular edema, basic defect is: 
Select and explain. 
A. Breakdown of inner blood retinal barrier, B. Breakdown of outer blood retinal barrier, C. Increased permeability of the choriocapillaris, D. All of the above
A: Breakdown of inner blood retinal barrier
Answer: A: Breakdown of inner blood retinal barrier 
Explanation: Ans. Breakdown of inner blood retinal barrier