<prompt> All of the following are the risk factors for carcinoma Gallbladder exceptPrimary sclerosing cholangitisProcelain gallbladderMultiple 2cm gallstonesCholedochal cyst  <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 