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: Pathology
Which of the following is sex cord stromal tumor? 
Select and explain. 
A. Yolk sac tumor, B. Seminoma, C. Leydig cell tumor, D. Choriocarcinoma
C: Leydig cell tumor
Answer: C: Leydig cell tumor 
Explanation: Sertoli cell tumor and Leydig cell tumor are sex cord stromal tumors.