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: Radiology
"Sunray appearance" on X-rays is suggestive of: 
Select and explain. 
A. A chondrosarcoma, B. A metastatic tumour in the bone, C. A metastatic tumour in the bone, D. An Ewing's sarcoma
C: A metastatic tumour in the bone
Answer: C: A metastatic tumour in the bone 
Explanation: Ans. An osteogenic sarcoma