A 15-year-old boy presents with knee pain. X-ray shows a ‘sunburst’ periosteal reaction in the distal femur. What is the most likely diagnosis?
AEwing Sarcoma
BOsteosarcoma
CChondrosarcoma
DOsteoid Osteoma
Explanation: A 'sunburst' periosteal reaction and Codman's triangle located in the metaphysis of a long bone in an adolescent is the classic radiographic presentation of osteosarcoma.