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': 'Most common testicular tumor in Pre pubertal age \nSelect and explain. \nA. Seminomas, B. Sertoli cell tumors, C. Leydig cell tumors, D. Yolk sac tumors', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Yolk sac tumors are most commonly found in pre pubertal age group.', 'role': 'assistant'}]