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
In fracture maxilla most common nerve involved is? 
Select and explain. 
A. Infra orbital nerve, B. Supraorbital nerve, C. Trochlear nerve, D. Mandibular nerve
A: Infra orbital nerve
Answer: A: Infra orbital nerve 
Explanation: 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