This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: ENT
Which of the following malignant salivary gland tumours has a tendency for perineural invasion? 
Select and explain. 
A. Mucoepidermoid carcinoma, B. Adenoid cystic carcinoma, C. Adenocarcinoma, D. Acinous cell carcinoma
B: Adenoid cystic carcinoma
Answer: B: Adenoid cystic carcinoma 
Explanation: Adenoid cystic carcinoma has a propensity to spread by perineural invasion. Depending on site most common nerves involved are maxillary and mandibular division of trigeminal.