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: Surgery
Differential diagnosis of a lesion, histologically resembling giant cell tumour in the small bones of the hand/feet, include all of the following except: March 2005 
Select and explain. 
A. Fibrosarcoma, B. Enchondroma, C. Hyperpahyroidism, D. Aneurysmal bone cyst
A: Fibrosarcoma
Answer: A: Fibrosarcoma 
Explanation: Ans. A: Fibrosarcoma Lytic bony lesions: Differential Diagnosis (Mnemonic = FOGMACHINES): F = Fibrous Dysplasia 0 = Osteoblastoma G = Giant Cell Tumour M = Metastasis / Mveloma A = Aneurysmal Bone Cyst C = Chondroblastoma H = Hyperparathyroidism (brown tumours)/ Hemangioma I = Infection N = Non-ossifying Fibroma E = Eosinophilic Granuloma/ Enchondroma S = Solitary Bone Cyst