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
Treatment of submandibular salivary gland ductcalculi is 
Select and explain. 
A. 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
C: Opening the duct and removal of calculus
Answer: C: Opening the duct and removal of calculus 
Explanation: None