This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
Commonest site of occurrence of chondrosarcoma is: 
Select and explain. 
A. Pelvis, B. Femur, C. Ribs, D. Proximal tibia
A: Pelvis
Answer: A: Pelvis 
Explanation: CHONDROSARCOMA It occurs over a broad age range: Peaks between 40 and 60 years for primary chondrosarcoma,and Between 25 and 45 years for secondary chondrosarcoma. Most are located in a proximal location such as: pelvis (most common site) proximal femur proximal humerus They occur in bones derived from enchondral ossification. Usually metaphyseal and central i.e. arising in the medullary cavity