This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder Cancer, Subject name: Surgery
[{'content': 'Which does not predispose to cholangiocarcinoma: \nSelect and explain. \nA. Ulcerative colitis, B. Clonorchis sinensis, C. Choledochal cyst, D. Chronic pancreatitis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Chronic pancreatitis Risk factors for CholangiocarcinomaPrimary sclerosing cholangitisCholedochal cystUlcerative colitis Mnemonic 5 C'sClonorchis sinensis inf.Chronic typhoid carriersOther risk factorsHepatolithiasisBiliary enteric anastomosisLiver flukesDietary nitrosaminesExposure to thorotrast, dioxin", 'role': 'assistant'}]