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': 'Punched out lesion in the skull is indicative of: September 2008 \nSelect and explain. \nA. Ewings sarcoma, B. Multiple myeloma, C. Metastasis, D. Osteosarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Multiple Myeloma', 'role': 'assistant'}]