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': 'Investigation of choice for Acute pancreatitis:September 2005 & 2006 \nSelect and explain. \nA. X-ray abdomen, B. CT scan, C. USG, D. ERCP', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: CT scanContrast CT is the imaging method of choice for delineating pancreas as well as demonstrating necrotizing pancreatitis and many of the complications of acute pancreatitis (e.g. pancreatic pseudocyst)Accuracy of contrast CT >90% when there is more than 30% glandular necrosisPresence of pancreatic necrosis is a good marker of prognosis.However in early stages routine contrast CT is of little value in the critically ill. Administration of contrast may increase risk of renal failure', 'role': 'assistant'}]