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
[{'content': 'Chain of lakes appearance is seen in? \nSelect and explain. \nA. Chronic pancreatitis, B. Acute pancreatitis, C. Gall stone ileus, D. Sub-acute intestinal obstruction', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Chronic pancreatitisRef.Sutton's Radiology 7thedn volume 1 p 798, Sabiston textbook of surgery 18thed ch", 'role': 'assistant'}]