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: Surgery
In which of the following perineural invasion in head and neck cancer most commonly seen. 
Select and explain. 
A. Adenocarcinoma, B. Adenoid cystic Ca, C. Basal cell Ca, D. Squamous Cell Ca
B: Adenoid cystic Ca
Answer: B: Adenoid cystic Ca 
Explanation: .Ans is 'b' Adenoid cystic Ca