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': 'In pleomorphic adenoma mutation occurs in: \nSelect and explain. \nA. PLAG1 gene., B. PLAM1 gene, C. PLAG2 gene, D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]