This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
The following condition of GB is precancerous - 
Select and explain. 
A. Cholesterosis, B. Porcelain gall bladder, C. Biliary atresia, D. Choledochal cyst
B: Porcelain gall bladder
Answer: B: Porcelain gall bladder 
Explanation: Gallbladders containing stones or infectious agents develop cancer as a result of irritative trauma and chronic inflammation. Carcinogenic derivatives of bile acids also may play a role.
Porcelain gallbladder increases the risk of cancer.
Choledochal cysts predispose to stone formation, stenosis and stricture, pancreatitis, and obstructive biliary complications within the liver. In the older patient, the risk of bile duct carcinoma is elevated.