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: ENT
[{'content': 'A patient present with enophthalmos after a trauma to face by blunt object.There is no fever and no extraocular muscle palsy. Diagnosis is: \nSelect and explain. \nA. Fracture maxilla, B. Fracture zygoma, C. Blow out fracture, D. Fracture ethmoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Blow out fracture is isolated fracture of orbital floor, when a large blunt object strikes the globe. It presents with:Ecchymosis of lid, conjunctiva and scleraEnophthalmosDiplopia due to displacement of eye ballAnaesth esia of cheek and upper lip, if infraorbital nerve is involved.', 'role': 'assistant'}]