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
Tumour most sensitive to radiotherapy is- 
Select and explain. 
A. Osteogenic sarcoma, B. Ewing's sarcoma, C. Chondrosarcoma, D. Osteoclastoma
B: Ewing's sarcoma
Answer: B: Ewing's sarcoma 
Explanation: Ans- B Most Radio + chemo sensitive = Ewing's sarcoma Most Common Radiation induced And also the most radio resistant = Osteosarcoma