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
IoC for chronic pancreatitis 
Select and explain. 
A. USG, B. Abdominal X-ray, C. Barium study, D. ERCP
D: ERCP
Answer: D: ERCP 
Explanation: ERCP (Endoscopic retrograde cholangio pancreatography) is IoC for Chronic Pancreatitis.