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: 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: None