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: Ans. is 'c' i.e. Opening the duct & removal of calculus