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
Which does not predispose to cholangiocarcinoma: 
Select and explain. 
A. Ulcerative colitis, B. Clonorchis sinensis, C. Choledochal cyst, D. Chronic pancreatitis
D: Chronic pancreatitis
Answer: D: Chronic pancreatitis 
Explanation: 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