This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': '28. In cadwell luc operation the nasoantral window is made through: \nSelect and explain. \nA. superior meatus, B. Inferior meatus, C. Middle meatus, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Caldwell-Luc operation is a process of opening the maxillary antrum through canine fossa by sublabial approach and dealing with the pathology inside the antrum. Operation is also called anterior antrostomy as access to maxillary sinus is made through anterior wall of the sinus. Ref : Dhingra 7e pg 469.', 'role': 'assistant'}]