This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Risk factors for carcinoma Gallbladder are all except \nSelect and explain. \nA. Choledochal cysts, B. Xanthogranulomatous Cholecystitis, C. Calcification of gallbladder, D. Gallstone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]