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
[{'content': 'Radiorestistant tumor is- \nSelect and explain. \nA. Ewings sarcoma, B. Retinoblastoma, C. Osteosarcoma, D. Neuroblastoma', 'role': 'user'}, {'content': "Answer: C \nExplanation: RADIORESISTANT RADIOSENSITIVE Osteosarcoma Wilms tumor Melanoma Ewing's sarcoma Hepatic carcinoma Lymphoma Pancreatic carcinoma Myeloma Seminoma / Dysgerminoma", 'role': 'assistant'}]