This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT and MRI of the Pancreas, Subject name: Radiology
IOC acute pancreatitis: 
Select and explain. 
A. Contrast CT, B. USG, C. Serum lipase, D. Serum amylase
A: Contrast CT
Answer: A: Contrast CT 
Explanation: Ans. (a) Contrast CTRef: Bailey 26th ed. /192, 1121* CECT can be used to assess the severity of acute pancreatitis and to estimate the prognosis. Balthazar et al developed a grading system in which patients with acute pancreatitis are classified into one of the following 5 grades:# Grade A - Normal-appearing pancreas# Grade B - Focal or diffuse enlargement of the pancreas# Grade C - Pancreatic gland abnormalities associated with peri-pancreatic fat infiltration# Grade D - A single fluid collection# Grade E - Two or more fluid collections