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: Medicine
Features of carotid-cavernous fistula include - 
Select and explain. 
A. Dilated superior ophthalmic vein on CT scan, B. Blood in the Schlemm's canal, C. Proptosis of contralateral eye suggests bilateral carotid-cavernous fistula, D. Traumatic fistula rarely close spontaneously
C: Proptosis of contralateral eye suggests bilateral carotid-cavernous fistula
Answer: C: Proptosis of contralateral eye suggests bilateral carotid-cavernous fistula 
Explanation: None