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
All of the following are risk factors for carcinoma Gallbladder except 
Select and explain. 
A. Typhoid carriers, B. Adenomatous gallbladder polyps, C. Choledochal cyst, D. Oral contraceptives
D: Oral contraceptives
Answer: D: Oral contraceptives 
Explanation: There is no association with OCP's 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