This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'Radiotherapy is most useful in: \nSelect and explain. \nA. Seminoma, B. Melanoma, C. Osteosarcoma, D. Pancreatic carcinoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A. SeminomaSeminoma is a highly radiosensitive tumor and hence radiotherapy is commonly used for treatment.Radiosensitive and Radioresistant TumorsHighly radiosensitive tumors are* Lymphoma* Seminoma* Myeloma* Ewing's sarcoma* Wilms' tumorHighly radioresistant tumors are* Melanoma* Osteosarcoma* Pancreatic carcinoma* Hepatic carcinoma* Renal cell carcinoma", 'role': 'assistant'}]