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': 'The "Distant metastasis" of bone can be best detected by: \nSelect and explain. \nA. NMI, B. Bone scan, C. CT, D. Intravenous venogram', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bone scan', 'role': 'assistant'}]