This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
[{'content': 'Synytial osteoclastic giant Cells are seen in all except \nSelect and explain. \nA. Osteosarcoma, B. Ewings sarcoma, C. Chondroblastoma, D. Aneurysmal bone cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Robbins page no 8th edition', 'role': 'assistant'}]