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': 'Undescended testis increases the risk of which cancer \nSelect and explain. \nA. Teratoma, B. Seminoma, C. Yolk sac tumor, D. Lymphoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Seminoma risk is increased by 8-9 times by undescended testis.', 'role': 'assistant'}]