This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder Cancer, Subject name: Surgery
Precancerous lesion of gall bladder is 
Select and explain. 
A. Porcelain gall bladder, B. Mirrizi syndrome, C. Cholesterosis, D. Acalculous Cholecystitis
A: Porcelain gall bladder
Answer: A: Porcelain gall bladder 
Explanation: Ans is 'a' ie Porcelain gall bladder "The calcified porcelain' gallbladder is associated with more than a 20% incidence of gallbladder carcinoma. These gallbladders should be removed, even if the patients are asymptomatic" - Schwartz SurgeryMirizzi SyndromeBiliary obstruction may occur in cases of acute cholecystitis, as a result of external compression of the CBD by a large stone impacted in the Hartman pouch and the associated intense pericholecystic inflammatory process; this is termed Mirizzi Syndrome. (Washington Manual of Surgery, 4/e, p 310)