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': 'Dead bone in X-ray is? \nSelect and explain. \nA. More radiolucent, B. More radiopaque, C. Same as normal bone, D. Variable', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dead bone as seen in Avascular necrosis, Perthes disease, TB, osteomyelitis is usually more opaque than normal in X-ray.', 'role': 'assistant'}]