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': "Radiological signs of acute pancreatitis include the following except - \nSelect and explain. \nA. Colon cut-off sign, B. Cullen's sign, C. Renal halo sign, D. Sentinel loop sign", 'role': 'user'}, {'content': "Answer: B \nExplanation: All the given signs are present in acute pancreatitis. However, Cullen's sign is a clinical sign (not radiological sign).", 'role': 'assistant'}]