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
[{'content': '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 \nSelect and explain. \nA. Fibrosarcoma, B. Enchondroma, C. Hyperpahyroidism, D. Aneurysmal bone cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]