This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
[{'content': 'A 79-year-old man had a chest x-ray because of a history of smoking. However, a calcified gallbladder was noted. This was confirmed by CAT scan. The patient is asymptomatic and has no medical illnesses. The next step in the management of this patient should be: \nSelect and explain. \nA. Cholecystectomy, B. CT-guided percutaneous core needle biopsy, C. Cholecystectomy with pancreaticoduodenectomy, D. Cholecystostomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Due to the high rate of carcinoma (up to 50% of cases) found in patients with calcified gallbladders, cholecystectomy is indicated. A biopsy would not be helpful because of the possibility of missing the tumor. A negative biopsy would not rule out cancer. A pancreaticoduodenectomy is not part of the treatment of gallbladder cancer. Cholecystostomy (tube drainage of the gallbladder) would not help the patient.', 'role': 'assistant'}]