<prompt> Risk factors for carcinoma Gallbladder are all exceptCholedochal cystsXanthogranulomatous CholecystitisCalcification of gallbladderGallstone  <response>: Risk factors for Carcinoma Gallbladder Gallstones 3cm Procelain gallbladder Anomalous pancreaticobiliary junction APBDJ Choledochal cysts Adenomatous polyps Primary sclerosing cholangitis Obesity Salmonella typhi infection Ref: Sabiston 20th edition Pgno :1510 