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
[{'content': '"Sunray appearance" on X-rays is suggestive of: \nSelect and explain. \nA. A chondrosarcoma, B. A metastatic tumour in the bone, C. A metastatic tumour in the bone, D. An Ewing\'s sarcoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. An osteogenic sarcoma', 'role': 'assistant'}]