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': 'In which stage of testicular tumor there is involvement of both testes and epididymis with high inguinal orchiectomy indicated as the treatment? \nSelect and explain. \nA. Stage I, B. Stage II, C. Stage III, D. Stage IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stage I testicular tumor is limited to testis and epididymis with no evidence of vascular invasion. It is completely resected by high inguinal orchiectomy. In stage II there is invasion beyond tunica albuginea or has vascular invasion and nodal metastasis. In stage III there is invasion of spermatic cord and involvement of retroperitoneal lymph nodes. In stage IV there is invasion of scrotum and presence of metastasis beyond the retroperitoneum ( bone, liver, lung).', 'role': 'assistant'}]