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': 'Moth eaten bone is ? \nSelect and explain. \nA. Osteoid osteoma, B. Multiple myeloma, C. Eosinophilic granuloma, D. Chondromyxoid fibroma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Multiple myeloma Patterns of bone destruction present in a lytic lesion ? Geographic : Sharp clearly defined margins. Less aggressive, benign. Eg: non ossifying fibroma, chondromyxoid fibroma, eosinophilic granuloma. Moth eaten appearance : Holes in destroyed bone. Rapid growth, malignant Eg: Myeloma, metastasis, lymphoma. Permeative : Ill defined, diffuse, somewhat subtle destructive process of bone. Eg: Lymphoma, leukemia, Ewing's sarcoma, osteomyelitis.", 'role': 'assistant'}]