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 in man aged 70 years is most likely to be \nSelect and explain. \nA. Sertoli cell tumor, B. Lymphoma, C. Yolk sac tumors, D. Teratoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lymphoma is common in old age patients.', 'role': 'assistant'}]