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': 'All of the following are the risk factors for carcinoma Gallbladder except \nSelect and explain. \nA. Primary sclerosing cholangitis, B. Procelain gallbladder, C. Multiple 2cm gallstones, D. Choledochal cyst', 'role': 'user'}, {'content': 'Answer: C \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'}]