This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Most common cause of rubeosis iridis - \nSelect and explain. \nA. Tumor, B. CRAO, C. Radiation retinopathy, D. Diabetic retinopathy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Rubeosis iridis -neovascularisation of iris.it develops following retinal ischemia which is a common feature of: *proliferative diabetic retinopathy *central retinal vein occlusion *sickle cell retinopathy *Eale's disease Ref:Comprehensive ophthalmology-AK Khurana 6th edition chapter-10 page no:250", 'role': 'assistant'}]