<prompt> Risk factor for cholangiocarcinoma all except:Chronic typhoid carrierChronic ulcerative colitisParasitic infestationCholedocholithiasis  <response>: Choledocholithiasis Risk factors for Choangiocarcinoma - Primary sclerosing cholangitis - Choledochal cyst - Ulcerative colitis - Clonorchis sinensis - Chronic typhoid carriers Other risk factors - Hepatolithiasis - Biliary enteric anastomosis - Liver flukes - Dietary nitrosamines - Exposure to thorotrast, dioxin Mnemonic 5 Cs 