This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
"Sunray appearance" on x-rays is suggestive of : 
Select and explain. 
A. Chondrosarcoma, B. Metastatic tumor in the bone, C. Osteogenic sarcoma, D. Ewing's sarcoma
C: Osteogenic sarcoma
Answer: C: Osteogenic sarcoma 
Explanation: Osteosarcoma - New bone is laid down along the blood vessels within the tumor growing centrifugally giving rise to a 'Sun -ray appearance' on x -ray. Chondrosarcoma- "Speckled" calcification on x-ray Ewings sarcoma - Second most common malignant. Classic x-ray appearance is the "onion skin"