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
Commonest complication of Caldwell-Luc operations is: 
Select and explain. 
A. Oroantral fistula, B. Infra orbital nerve injury, C. Haemorrhage, D. Orbital cellulitis
B: Infra orbital nerve injury
Answer: B: Infra orbital nerve injury 
Explanation: Ans. B infraorbital nerve palsy Ref. Scott Brown 7th/ed Vol 2 p 1494 M/C Complication of Caldwell-Luc operation is injury to infraorbital nerve which occurs is 21 % cases.