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
Visual loss in diabetic retinopathy is due to all except: 
Select and explain. 
A. Cataract formation, B. Background diabetic retinopathy, C. Ischaemic maculopathy, D. Vitreous hemorrhage
B: Background diabetic retinopathy
Answer: B: Background diabetic retinopathy 
Explanation: Ans. Background diabetic retinopathy