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
Salivary duct calculi 
Select and explain. 
A. Produce pain on eating, B. Are commonest in the parotid ducts, C. Are common cause of acute parotitis, D. Are associated with hypercaleaemic states
A: Produce pain on eating
Answer: A: Produce pain on eating 
Explanation: None