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
Nerve injured in Caldwell Lus operation is? 
Select and explain. 
A. Lingual nerve, B. Infra orbital nerve, C. Optic nerve, D. Facial nerve
B: Infra orbital nerve
Answer: B: Infra orbital nerve 
Explanation: Ans. is'b'i.e., Infra orbital nerve.Complications of Caldwell - Luc operationPost - operative bleeding. This can be controlled by nasal packAnaesthesia of the cheek due to stretching of infraorbital nerve. It may last for a few weeks or months.Anaesthesia TeethInjury to nasolacrimal ductSublabial fistula (oroantral fistula)Osteomyelitis of maxilla (rare)