This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
In cholangiography CBD stone appears as 
Select and explain. 
A. Meniscus sign, B. Cutoff sign, C. Slight flow of dye from the sides, D. Ability to absorb water
A: Meniscus sign
Answer: A: Meniscus sign 
Explanation: Mr cholangiography : provides excellent anatomic detail, with sensitivity and specificity of 95 %and 98 %respectively for CBD stones Typical meniscus sign is seen when the CBD stone is wedged at the level of the papilla Ref: Sutton 6th edition Pgno : 971