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
[{'content': 'In cystoid macular edema, basic defect is: \nSelect and explain. \nA. Breakdown of inner blood retinal barrier, B. Breakdown of outer blood retinal barrier, C. Increased permeability of the choriocapillaris, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Breakdown of inner blood retinal barrier', 'role': 'assistant'}]