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
[{'content': 'Which of the following is sex cord stromal tumor? \nSelect and explain. \nA. Yolk sac tumor, B. Seminoma, C. Leydig cell tumor, D. Choriocarcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sertoli cell tumor and Leydig cell tumor are sex cord stromal tumors.', 'role': 'assistant'}]