This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
Gold standard test for investigation for chronic Pancreatitis detection of early pathologies and simultaneous treatment possible (e.g., duct dilation, stent inseion) Ductal stones, seen as filling defects "Chain of lakes" or "string of pearls" appearance (characteristic feature) Irregularity, dilation of the main pancreatic duct 
Select and explain. 
A. MRI, B. ERCP, C. Pancreatic function tests, D. Fecal fat estimation
B: ERCP
Answer: B: ERCP 
Explanation: ERCP - Considered the gold standard for the diagnosis of CP, the advent of secretion MRCP and EUS have significantly decreased its role as a diagnostic test ERCP : detection of early pathologies and simultaneous treatment possible (e.g., duct dilation, stent inseion) Ductal stones, seen as filling defects"Chain of lakes" or "string of pearls" appearance (characteristic feature)Irregularity, dilation of the main pancreatic duct Ref: Sabiston 20th edition Pgno :1535