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
[{'content': 'In cholangiography CBD stone appears as \nSelect and explain. \nA. Meniscus sign, B. Cutoff sign, C. Slight flow of dye from the sides, D. Ability to absorb water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]