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 man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia: \nSelect and explain. \nA. Pneumo-orbit, B. Caroticocavernous fistula, C. Retro-orbital hematoma, D. Orbital cellulitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Retro-orbital hematoma', 'role': 'assistant'}]