This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
Linear filling defect on ERCP is characteristic of - 
Select and explain. 
A. Bile duct stone, B. Pancreatic duct stone, C. Worm in biliary tree, D. Stricture
C: Worm in biliary tree
Answer: C: Worm in biliary tree 
Explanation: Ans. is 'c' i.e., Worm in biliary tree Imaging in ascariasiso Plain abdominal X ray: calcified worm,o USG: moving echogenic structures or strips,o ERCP: linear filling defect.