This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Surgery, Subject name: ENT
[{'content': 'In fracture maxilla most common nerve involved is? \nSelect and explain. \nA. Infra orbital nerve, B. Supraorbital nerve, C. Trochlear nerve, D. Mandibular nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ANSWER: (A) Infra orbital nerveREF: Dhingra 4th ed p. 174Clinical Features of maxillary fractures:Ecchymosis of lid, conjunctiva and scleraEnophthalmos with inferior displacement of the eyeball. This becomes apparent when edema subsides.Diplopia, -which may be due to displacement of the eyeball or entrapment of inferior rectus and inferior oblique muscles.Hypoaesthesia or anesthesia of cheek and upper lip, if infraorbital nerve is involved', 'role': 'assistant'}]