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': '76 year old man presents with a lytic lesion in the vertebrae. X-ray skull showed multiple punched out lesions. The diagnosis is – \nSelect and explain. \nA. Metastasis, B. Multiple myeloma, C. Osteomalacia, D. Hyperparathyroidism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Punched out lesions of skull are seen both in Eosinophilic granuloma and multiple myeloma. However,\xa0beveled edges (double contour)\xa0is characteristic of eosinophilic granuloma due to uneven destruction of the inner and outer table of the skull.\n\n\xa0 \xa0 \xa0 \xa0 \xa0 Punched out lesions of skull\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0→\xa0 Multiple myeloma\n\xa0 \xa0 \xa0 \xa0 \xa0 Punched out lesions with beveled edges\xa0\xa0\xa0→\xa0\xa0Eosinophilic granuloma', 'role': 'assistant'}]