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': "Hot spot on bone scan is seen in all the following conditions except: \nSelect and explain. \nA. Osteomyelitis, B. Fibrous dysplasia, C. Paget's disease, D. Fibrous cortical defect", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fibrous cortical defect - do not have osteoblastic activity.', 'role': 'assistant'}]