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
Electron beam therapy is used for which tumor ? 
Select and explain. 
A. Renal carcinoma, B. Kaposi sarcoma, C. Hepatic carcinoma, D. AML
B: Kaposi sarcoma
Answer: B: Kaposi sarcoma 
Explanation: Ans. is'b'i.e., Kaposi sarcomaElectron-beam radiation therapy is the most common modality employed for the treatment of localized KS.