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': 'Traumatic eye with late presentation of hyperaemic sclera with unilateral proptosis is due to - \nSelect and explain. \nA. Retrobulbar hematoma, B. Retrobulbar cellulitis, C. Carotico- cavernous fistula, D. Pneumo- orbit', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Retrobulbar hematoma usually presents with a history of trauma, painful exophthalmos (proptosis), retriction of extraocular movement, diffuse subconjunctival hemorrhage, periorbital edema and ecchymosis.\nRetrorbital abscess develops as a complication of orbital cellulitis (there is no history of symptoms of orbital cellulitis in this question).\nCarotico-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.\nSorry friends, I could not get the reference for pneumo-orbit.', 'role': 'assistant'}]