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
Graveyard of ENT surgeon 
Select and explain. 
A. Pyriform Fossa, B. Bucco Labial sulcus, C. Tonsilolingual sulcus, D. Peritonsillar space
C: Tonsilolingual sulcus
Answer: C: Tonsilolingual sulcus 
Explanation: Tonsilolingual sulcus is seat of carcinoma usually missed by ENT doctor in OPD to check.