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
Hot spot on bone scan is seen in all the following conditions except: 
Select and explain. 
A. Osteomyelitis, B. Fibrous dysplasia, C. Paget's disease, D. Fibrous cortical defect
D: Fibrous cortical defect
Answer: D: Fibrous cortical defect 
Explanation: Fibrous cortical defect - do not have osteoblastic activity.