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': 'All the following are true about Papilledema except- \nSelect and explain. \nA. It is a purely non-inflammatory phenomenon, B. Transient loss of vision occurs, C. First sign is blurring of the nasal side of the optic disc, D. Sudden loss of vision with painful eye movement', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There is gradual painless loss of vision\nPapilloedema is non- inflammatory edema of optic disc. Visual symptoms (only in 25% of patients) start as transient obscurations of vision.\nEarliest ophthalmoscopic sign is blurring of the margins of the optic disc, which starts at the upper and lower nasal margins and entends to nasal side.', 'role': 'assistant'}]