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': 'Features of papilloedema include all except: \nSelect and explain. \nA. May be due to intracranial haemorrhage, B. Disc becomes elevated, C. Cotton wool spots may be seen, D. Vision is impaired', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Vision is impaired', 'role': 'assistant'}]