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': 'Low dose radiotherapy is given for: \nSelect and explain. \nA. Seminoma, B. Malignant melanoma, C. Osteosarcoma, D. Chondrosarcoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Seminoma', 'role': 'assistant'}]