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': 'Sialolith in the excretory duct, will result in: \nSelect and explain. \nA. chronic sialadenitis, B. mucous retention cyst, C. pleomorphic adenoma, D. rupture of the duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]