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
Sialogram of a normal salivary gland appears as: 
Select and explain. 
A. Leafy tree, B. Leafless tree, C. Sialolithiasis, D. Sialgectasia
B: Leafless tree
Answer: B: Leafless tree 
Explanation: None