This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': "Radioresistant tumour is \nSelect and explain. \nA. Ewing's sarcoma, B. Osteosarcoma, C. Retinoblastoma, D. Neuroblastoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Highly resistantHighly sensitiveMaligant melanomaOsteosarcomaSeminomaMultiple myelomaEwings sarcomaWilms tumourLymphoma(Ref: Harrison's principals of Internal medicine, 17th Ed page 612)", 'role': 'assistant'}]