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: Surgery
[{'content': "The 'beading' appearance is seen in the condition: \nSelect and explain. \nA. Chronic pancreatitis, B. Acute pancreatitis, C. Gall stone ileus, D. Sub-acute intestinal obstruction", 'role': 'user'}, {'content': 'Answer: A \nExplanation: In chronic pancreatitis, the pancreatic duct may show beading or a chain-of-lakes or string-of-pearls appearance because of alternating stenosis and dilatation of the pancreatic duct. Other features of chronic pancreatitis include strictures, cysts and ductal calculi.', 'role': 'assistant'}]