<prompt> All of the following are the risk factors for carcinoma gallbladder except:Primary sclerosing cholangitisPorcelain gallbladderMultiple 2 cm gallstonesCholedochal cyst  <response>: Risk Factors of Carcinoma Gallbladder Gallstones 3 cm Porcelain gallbladder Anomalous pancreatobiliary junction Choledochal cysts Adenomatous polyps Primary sclerosing cholangitis Obesity Salmonella typhi infection 