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
[{'content': 'Chain of lakes appearance on ERCP is seen in: \nSelect and explain. \nA. Choledocholithiasis, B. Chronic relapsing pancreatitis, C. Traumatic pancreatitis, D. Carcinoma head of pancreas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Chronic relapsing pancreatitis', 'role': 'assistant'}]