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': 'Which of the following is not an indication for cholecystectomy: \nSelect and explain. \nA. 70 year old male with symptomatic gall stone, B. 20 years old male with sickle cell anemia and symptomatic gallstones, C. 65 year old female with a large gallbladder polyp, D. 55 year old with an asymptomatic gallstone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (55 year old with an asymptomatic gallstone): Prophylactic cholecystectomy is not warranted in an asymptomatic patient.', 'role': 'assistant'}]