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
A young man following A presented with proptosis and pain in right eye after four days. On examination there is bruise on forehead and right eye. What is the diagnosis: 
Select and explain. 
A. Cavernous sinus thrombosis, B. Internal carotid aery aneurysm, C. Carotico-cavernous fistula, D. Fracture of sphenoid
C: Carotico-cavernous fistula
Answer: C: Carotico-cavernous fistula 
Explanation: Ans. Carotico-cavernous fistula