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': 'IoC for chronic pancreatitis \nSelect and explain. \nA. USG, B. Abdominal X-ray, C. Barium study, D. ERCP', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ERCP (Endoscopic retrograde cholangio pancreatography) is IoC for Chronic Pancreatitis.', 'role': 'assistant'}]