This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': "Tumour most sensitive to radiotherapy is- \nSelect and explain. \nA. Osteogenic sarcoma, B. Ewing's sarcoma, C. Chondrosarcoma, D. Osteoclastoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans- B Most Radio + chemo sensitive = Ewing's sarcoma Most Common Radiation induced And also the most radio resistant = Osteosarcoma", 'role': 'assistant'}]