This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
[{'content': 'Early fundoscopic sign in Papilloedema \nSelect and explain. \nA. Blurring of disc margin, B. Hyperemia of disc, C. Splinter hemorrhage, D. Blurring of peripapillary nerve fiber layer', 'role': 'user'}, {'content': "Answer: A \nExplanation: (A) Blurring of disc margin # EARLY PAPILLEDEMA:> Disc elevation> Venous distention and tortuosity> Obscuration of the normal disc margin and overlying retinal vessels.> Absence of spontaneous venous pulsations.# Papilloedema symptoms are generally absent or vague and vision may be unimpaired for a long time.> This applies particularly to the central vision which may be unaffected sometimes even in the presence of a macular fan> Episodes of transient attacks of blurred vision, or transient obscurations of vision, usually described as bilateral or monocular 'black-outs' lasting for a few seconds often precipitated by changes in posture, are not uncommon in the initial stages.> As the condition progresses, however, two additional signs may be found--an enlargement of the blind spot owing to separation of the retina around the disc by the oedema and a progressive contraction of the visual field due to atrophy of the nerve.> At this stage, relative scotoma, first to green and red, may be present", 'role': 'assistant'}]