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
[{'content': 'All of the below statements are true about papilledema, EXCEPT: \nSelect and explain. \nA. Extracellular edema, B. Disruption of neurofilament, C. Stasis of axoplasmic flow, D. Axonal swelling', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]