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': 'Sialoliths are most common in the: \nSelect and explain. \nA. Stenson duct., B. Wharton duct., C. Bartholin duct., D. Duct of Rivinus.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]