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: Dental
Injecting dye for diagnosis of salivary gland 
Select and explain. 
A. Angiogram, B. Sialography, C. Angiogram, D. Tomography
B: Sialography
Answer: B: Sialography 
Explanation: None