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': 'T.B. testis first affects: \nSelect and explain. \nA. Vas, B. Epididymis, C. Body of testis, D. Tunica vaginalis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The disease first affects the epididymis. The body of testis may remain uninvolved for years, but the contra lateral epididymis often becomes diseased.\nTreatment is - ATT\nif ds. does not resolve, epididymectomy or orchidectomy is indicated.', 'role': 'assistant'}]