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
The X-ray appearance of a CBD stone on cholangiography is: 
Select and explain. 
A. Meniscus appearance, B. Eccentric occlusion, C. Sudden cut off, D. Smooth tapering
A: Meniscus appearance
Answer: A: Meniscus appearance 
Explanation: Ans. Meniscus appearance