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
Undescended testis increases the risk of which cancer 
Select and explain. 
A. Teratoma, B. Seminoma, C. Yolk sac tumor, D. Lymphoma
B: Seminoma
Answer: B: Seminoma 
Explanation: Seminoma risk is increased by 8-9 times by undescended testis.