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
Approach to Caldwell Luc operation is ? 
Select and explain. 
A. Hard palate, B. Sublabial sulcus, C. Inferior metus, D. Superior meatus
B: Sublabial sulcus
Answer: B: Sublabial sulcus 
Explanation: 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.