This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
[{'content': 'Dead bone on an X-ray appears? \nSelect and explain. \nA. More radiopaque, B. Radio-lucent, C. Less audio opaque, D. Is not seen at all', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans ADead bone is devoid of vascularity and hence there is no osteoclastic removal of calcium as well as osteoblastic remodeling hence it appears radio opaque on radiographs.', 'role': 'assistant'}]