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: Pathology
[{'content': "Which of the following parotid malignancy shows perineural spread: \nSelect and explain. \nA. Pleomorphic adenoma, B. Adenoid cystic carcinoma, C. Warthin's tumor, D. Ductal papilloma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]