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': 'Testicular tumour which responds best to radiation is: \nSelect and explain. \nA. Teratoma, B. Seminoma, C. Embryonal cell carcinoma, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Seminoma', 'role': 'assistant'}]