This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'Electron beam therapy is used for which tumor ? \nSelect and explain. \nA. Renal carcinoma, B. Kaposi sarcoma, C. Hepatic carcinoma, D. AML', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., Kaposi sarcomaElectron-beam radiation therapy is the most common modality employed for the treatment of localized KS.", 'role': 'assistant'}]