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
Tumour with perineural invasion: 
Select and explain. 
A. Adenocarcinoma, B. Adenoid cystic Ca, C. Basaal cell ca, D. Squamous cell ca
B: Adenoid cystic Ca
Answer: B: Adenoid cystic Ca 
Explanation: Ans is 'b' ie Adenocystic Ca