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
Investigation of choice for parotid gland calculi 
Select and explain. 
A. Xray, B. USG, C. Sialography, D. CT
C: Sialography
Answer: C: Sialography 
Explanation: For submandibular gland calucli IOC is XRay as they are radio-opaque.
For parotid gland calucli IOC is sialography as they are radioluscent.