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: Surgery
[{'content': 'Testicular tumor with best prognosis is \nSelect and explain. \nA. Teratoma, B. Seminoma, C. Yolk sac tumor, D. Sertoli cell tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Seminomas are radiosensitive tumors so prognosis is good.', 'role': 'assistant'}]