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
Ophthalmoscopic sign pathognomonic of optic nerve sheath meningioma is: 
Select and explain. 
A. Papilloedema, B. Optic atrophy, C. Opticociliary shunt, D. All of the above
C: Opticociliary shunt
Answer: C: Opticociliary shunt 
Explanation: Ans. Opticociliary shunt