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 of the below statements are true about papilledema, EXCEPT: 
Select and explain. 
A. Extracellular edema, B. Disruption of neurofilament, C. Stasis of axoplasmic flow, D. Axonal swelling
B: Disruption of neurofilament
Answer: B: Disruption of neurofilament 
Explanation: In papilledema, the alteration in the pressure gradient across the lamina cribrosa causes stasis of axoplasmic flow which in turn causes venous congestion, axonal swelling, and extracellular edema. Ref: Parson's Diseases of the Eye, 20th Edition, Page 330; Ophthalmology: A Pocket Textbook Atlas By Gerhard K. Lang, 2007, Page 382.