This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-ophthalmology, Subject name: Ophthalmology
Earliest sign of papilloedema - 
Select and explain. 
A. Less of pulsation, B. Blurring of disc margin, C. Obliteration of cup, D. Cotton-wool spots
B: Blurring of disc margin
Answer: B: Blurring of disc margin 
Explanation: Early (incipient )papilloedema is characterised by, obscuration of disc margins (nasal margins involved first , then superior , inferior and temporal) blurring of peripapillary nerve fibre layer absence of spontaneous venous pulsations at the disc mild hypaeremia Refer comprehensive ophthalmology (6 th edition )A K Khurana, page no. 324