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
[{'content': "Precancerous lesion of gallbladder is \nSelect and explain. \nA. Procelain gallbladder, B. Mirriz's syndrome, C. Cholesterolosis, D. Acalculous cholecystitis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Procelain Gallbladder Characterized by extensive encrustation of GB wall. Term Procelain gallbladder has been used to emphasise the blue discolouration and brittle consistency of GB wall at surgery Clinical features : Most(90%) are associated with gallstones Mean age of patients is 54 years (38-74 years) Patients are usually asymptomatic and the condition is usually found incidentally on plain abdominal radiographs, sonograms or CT images High frequency association (10%) is with GB adenocarcinoma Surgery should not be delayed even if patient is asymptomatic, because the occurrence of carcinoma is remarkably high Ref: Sabiston 20th edition Pgno :1512', 'role': 'assistant'}]