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
Traumatic eye with late presentation of hyperaemic sclera with unilateral proptosis is due to - 
Select and explain. 
A. Retrobulbar hematoma, B. Retrobulbar cellulitis, C. Carotico- cavernous fistula, D. Pneumo- orbit
A: Retrobulbar hematoma
Answer: A: Retrobulbar hematoma 
Explanation: Retrobulbar hematoma usually presents with a history of trauma, painful exophthalmos (proptosis), retriction of extraocular movement, diffuse subconjunctival hemorrhage, periorbital edema and ecchymosis.
Retrorbital abscess develops as a complication of orbital cellulitis (there is no history of symptoms of orbital cellulitis in this question).
Carotico-covernous fistula typically presents, days or weeks after the trauma. There is characteristic pulsatile exophthalmos with severe and sudden cephalic & orbital pain, a roaring sound in head synchronous with the pulse, decreased vision, diplopia and ophthalmoplegia.
Sorry friends, I could not get the reference for pneumo-orbit.