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: Surgery
[{'content': 'Treatment of calculus within the submandibular salivary gland is \nSelect and explain. \nA. Removal of sinus, B. Removal of the gland, C. Dichotomy, D. Milking of the stone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]