This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
[{'content': 'Which of the following is true about chondrosarcoma? \nSelect and explain. \nA. The peak incidence is between 10 and 20 years, B. It usually presents as a juxtacoical lesion, C. The sho bones of the extremities are the most common site, D. A slow growth rate is typical', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CHONDROSARCOMA : Chondrosarcoma originates from remnants of cailage within bones and most often involves the deeper poions of the pelvic bones of middle-aged or older people. It may arise in long bones, but the sho bones of the hand and foot are rarely involved. The tumor is composed of malignant cailage cells showing different degrees of maturation. Chondrosarcomas usually grow slowly. Ref: Maheshwari 9TH pg 246.', 'role': 'assistant'}]