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
Most common site for sialoliths is: 
Select and explain. 
A. Parotid duct, B. Parotid gland, C. Submandibular gland and duct, D. Sublingual gland
C: Submandibular gland and duct
Answer: C: Submandibular gland and duct 
Explanation: None