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
Not a predisposing factor for cholangiocarcinoma 
Select and explain. 
A. Asiatic cholangiohepatitis, B. Cholelithiasis, C. Ulcerative colitis, D. Choledochal cyst
B: Cholelithiasis
Answer: B: Cholelithiasis 
Explanation: Choledocholithiasis, not the cholelithiasis is a risk factor for cholangiocarcinoma Risk factors for cholangiocarcinoma Choledochal cyst Primary sclerosing cholangitis Ulcerative colitis. RPC or hepatolithiasis. Biliary enteric anastomosis HBV, HIV, HCV Choledocholithiasis Clonorchis sinensis and opisthorchis viverrini Cirrhosis Radon Asbestos, Nitrosamines, Dioxib(AND). Diabetes, Obesity, OCP's, smoking, Thorotrast, Isoniazid(DOSTI) Ref: Sabiston 20th edition Pgno :1514