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
Giant cells seen in -a)  Osteoclastomab)  Chondroblastomac)  Chordomad)  Osteitis fibrosa cystica 
Select and explain. 
A. ac, B. ab, C. ad, D. bc
B: ab
Answer: B: ab 
Explanation: Giant cell containing lesions
Benign
GCT (osteoclastoma)
Benign fibrous histiocytom
Non--ossifying fibroma
Chondroblastoma
Chondromyxoid fibroma
Fibrous dysplasia
Malignant
Giant cell containing osteogenic sarcoma
Malignant fibrous histiocytoma
Fibrosarcoma