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': 'The recurrence of pleomorphic adenoma is attributed \nSelect and explain. \nA. Presence  of an incomplete capsule, B. Mixed origin, C. Absence of capsule, D. Perineural spread', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]