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': 'Commonest complication of Caldwell-Luc operations is: \nSelect and explain. \nA. Oroantral fistula, B. Infra orbital nerve injury, C. Haemorrhage, D. Orbital cellulitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]