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': 'Approach to Caldwell Luc operation is ? \nSelect and explain. \nA. Hard palate, B. Sublabial sulcus, C. Inferior metus, D. Superior meatus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., Sublabial sulcus[Rel Dhingra Sh/ep. 422)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.", 'role': 'assistant'}]