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 submandibular salivary gland ductcalculi is - \nSelect and explain. \nA. Excision of submandicular gland, B. Opening the duct at the frenulum, C. Opening the duct and removal of calculus, D. Excision of gland and duct', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. Opening the duct & removal of calculus", 'role': 'assistant'}]