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
All are seen in papilloedema EXCEPT - 
Select and explain. 
A. Hyperemia of disc, B. Sudden vision loss, C. Post - neuritic atrophy, D. Macular fan
B: Sudden vision loss
Answer: B: Sudden vision loss 
Explanation: Vision loss occurs in long standing papilloedema (not in acute pappiloedema), and that occurs in less than 25% of patients.
Post neuritic atrophy also occurs in long standing papilloedema and not acute papilloedema.