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': "On 3 phase 99mTc-MDP bone scan, which of the following bone lesions will show least osteoblastic activity. \nSelect and explain. \nA. Paget's disease, B. Osteoid Osteoma, C. Fibrous Dysplasia, D. Fibrous coical defect", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Fibrous coical defect', 'role': 'assistant'}]