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 man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia: 
Select and explain. 
A. Pneumo-orbit, B. Caroticocavernous fistula, C. Retro-orbital hematoma, D. Orbital cellulitis
C: Retro-orbital hematoma
Answer: C: Retro-orbital hematoma 
Explanation: Ans. Retro-orbital hematoma