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': 'Investigation of choice for diagnosis of Acute Pancreatitis: \nSelect and explain. \nA. USG, B. Plain CT scan, C. CT scan with contrast, D. MRI Scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. CT scan with contrast', 'role': 'assistant'}]