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
[{'content': 'Precancerous lesion of gall bladder is- \nSelect and explain. \nA. Porcelain gall bladder, B. Mirrizi syndrome, C. Cholesterosis, D. Acalculous Cholecystitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]