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: Medicine
[{'content': 'Primary sclerosing cholangitis, true are - \nSelect and explain. \nA. Females, B. Associated with IBD, C. Involves intra & extrahepatic ducts, D. ERCP not helpful', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref image Davidson 23e p888', 'role': 'assistant'}]