This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Giant Cell Tumor (GCT) or Osteoclastoma, Subject name: Orthopaedics
The differential diagnosis of lesion, histologically resembling giant cell tumour in the small bones of the hands or feet, includes all of the following except: 
Select and explain. 
A. Aneursymal bone cyst, B. Fibrosarcoma, C. Osteosarcoma, D. Hyperparathyroidism
B: Fibrosarcoma
Answer: B: Fibrosarcoma 
Explanation: Ans. is 'b' i.e. Fibrosarcoma Histological differential diagnosis of Giant cell tumorGiant cell reparative granuloma (a benign reactive condition)Brown tumor of hyperparathyroidism Non-ossifying fibroma Benign fibrous histiocytoma Aneurysmal bone cyst Osteosarcoma with prominent giant cells.Metastatic ca with giant cells.