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
Sialography is used to detect anomaly of: 
Select and explain. 
A. Salivary duct only, B. Salivary gland, C. Salivary gland & duct, D. Salivary gland tumours
C: Salivary gland & duct
Answer: C: Salivary gland & duct 
Explanation: None