<prompt> Risk factors of gallbladder carcinoma are all exceptGallbladder PolypsTyphoid carriersExposure to carcinogens like nitrosamineEchinococcus Granulosus Infection  <response>: Ans. d Echinococcus Granulosus infectionRef: Bailey 26th edition Page 1116Risk factors of cancer GB: Gallstones Polyps Porcelain GB Choledochal cyst Anomalous pancreato bile duct junction Typhoid carriers Sclerosing cholangitis Ulcerative colitis Cholecysto enteric fistula Drugs- estrogens Carcinogens 