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 of CA GB except 
Select and explain. 
A. Gallstones, B. Adenomyomatosis, C. Procelain gallbladder, D. Choledochal cyst
B: Adenomyomatosis
Answer: B: Adenomyomatosis 
Explanation: Adenomyomatosis has no malignant potential Risk factors for carcinoma Gallbladder Gallstones >3cm Procelain gallbladder Anomalous pancreaticobiliary junction Choledochal cysts Adenomatous polyps Primary sclerosing cholangitis Obesity Salmonella typhi infection Ref : Sabiston 20th edition Pgno :1510