This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
[{'content': 'Risk factors of gallbladder carcinoma are all except \nSelect and explain. \nA. Gallbladder Polyps, B. Typhoid carriers, C. Exposure to carcinogens like nitrosamine, D. Echinococcus Granulosus Infection', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]