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: Surgery
Gold standard investigation for chronic pancreatitis 
Select and explain. 
A. MRI, B. ERCP, C. Pancreatic function tests, D. Faecal fat estimation
B: ERCP
Answer: B: ERCP 
Explanation: ERCP(Endoscopic retrograde cholangiopancreatography) is the most accurate way of elucidating the anatomy of duct and, in conjunction with the whole organ morphology, can help to determine the type of operation required. Reference : Bailey & Love, 27th Edition, page no = 1231