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': 'Rubeosis iridis is not seen in: \nSelect and explain. \nA. CRVO, B. CRAO, C. Diabetic retinopathy, D. Neovascularization', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. CRAO', 'role': 'assistant'}]