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: Unknown
[{'content': 'Which of the following is true for chondrosarcoma? \nSelect and explain. \nA. The peak incidence is between 10 and 20 years, B. It usually presents as a juxtacortical lesion, C. The short bones of the extremities are the most common site., D. A slow growth rate is typical', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chondrosarcoma originates from remnants of cartilage within bones and most often involves the deeper portions of the pelvic bones of middle-aged or older people. It may arise in long bones, but the short bones of the hand and foot are rarely involved. The tumor is composed of malignant cartilage cells showing different degrees of maturation. Chondrosarcomas usually grow slowly.', 'role': 'assistant'}]