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: Pathology
[{'content': 'Giant cells seen in -a)  Osteoclastomab)  Chondroblastomac)  Chordomad)  Osteitis fibrosa cystica \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Giant cell containing lesions\nBenign\nGCT (osteoclastoma)\nBenign fibrous histiocytom\nNon--ossifying fibroma\nChondroblastoma\nChondromyxoid fibroma\nFibrous dysplasia\nMalignant\nGiant cell containing osteogenic sarcoma\nMalignant fibrous histiocytoma\nFibrosarcoma', 'role': 'assistant'}]