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
On 3 phase 99mTc-MDP bone scan, which of the following bone lesions will show least osteoblastic activity. 
Select and explain. 
A. Paget's disease, B. Osteoid Osteoma, C. Fibrous Dysplasia, D. Fibrous coical defect
D: Fibrous coical defect
Answer: D: Fibrous coical defect 
Explanation: D i.e. Fibrous coical defect