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: Unknown
[{'content': 'The earliest sign of papilloedema - \nSelect and explain. \nA. Filling of the physiological cup, B. The blurring of the disc margin, C. Obliteration of cup, D. Cotton-wool spots', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Blurring of disc margin Ophthalmoscopic signs of papilloedema o Blurring of disc margin o Venous :- Engorgment, congestion, loss of pulsation (first sign) o Hyperemia of the disc with capillary dilatation. o Filling of physiological cup with gradual obliteration of physiological cup. o Gradual elvetion of disc (mushroom or dome shaped) with sharp bending of vessels over its margins. o Cotton- wool spots (soft exudates) and both flame shaped (superficial) and punctate (deep) hemorrhages o Macular fan or macular star due to hard exudates. o Late findings in long standing (vintage) papilloedema :- Markedly elevated disc with champagne cork appearance, post neuritic optic atrophy,corpora amylacea deposits on disc margin, generalized retinal pigmentation.", 'role': 'assistant'}]