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: Radiology
Scintiscan is taken by injecting: 
Select and explain. 
A. Ethidiol, B. Tc- Pertechnetate, C. Sinograffin, D. Any of the above
B: Tc- Pertechnetate
Answer: B: Tc- Pertechnetate 
Explanation: Salivary scan (scintiscan) is taken by injecting Tc – Pertechnetate intravenously. Salivary scan is usually contraindicated in acute inflammatory cases.