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': 'Neovascularisation is seen in \nSelect and explain. \nA. Central vein obstruction, B. Central retinal aery obstruction, C. Branch retinal vein obstruction, D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Central vein obstruction', 'role': 'assistant'}]