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': "Leafless fruit Laden tree or Cherry-blossom appearance on a sialogram indicates: \nSelect and explain. \nA. Mucoepidermoid cell carcinoma, B. Acinar cell carcinoma, C. Sjogren's syndrome, D. Pleomorphic adenoma", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]