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
Most common cause of rubeosis iridis 
Select and explain. 
A. Tumor, B. CRAO, C. Radiation retinopathy, D. Diabetic retinopathy
D: Diabetic retinopathy
Answer: D: Diabetic retinopathy 
Explanation: it develops following retinal ischemia which is a common feature of:
●proliferative diabetic retinopathy 
●central retinal vein occlusion 
●sickle cell retinopathy 
●Eale's disease