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': '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: \nSelect and explain. \nA. Cavernous sinus thrombosis, B. Internal carotid aery aneurysm, C. Carotico-cavernous fistula, D. Fracture of sphenoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Carotico-cavernous fistula', 'role': 'assistant'}]