This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiotherapy Pa 2, Subject name: Radiology
Radiorestistant tumor is- 
Select and explain. 
A. Ewings sarcoma, B. Retinoblastoma, C. Osteosarcoma, D. Neuroblastoma
C: Osteosarcoma
Answer: C: Osteosarcoma 
Explanation: RADIORESISTANT RADIOSENSITIVE Osteosarcoma Wilms tumor Melanoma Ewing's sarcoma Hepatic carcinoma Lymphoma Pancreatic carcinoma Myeloma Seminoma / Dysgerminoma