<prompt> Which of the following is not a risk factor for cholangiocarcinomaThorotrastRadonDioxinAflatoxin  <response>: 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, DioxibAND. Diabetes, Obesity, OCPs, smoking, Thorotrast, IsoniazidDOSTI Ref: Sabiston 20th edition Pgno :1514 