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
Subcapsular orchiectomy is done for cancer of - 
Select and explain. 
A. Testes, B. Prostate, C. Penis, D. Urethra
B: Prostate
Answer: B: Prostate 
Explanation: Bilateral orchidectomy, whether total or subcapsular, will eliminate the major source of testosterone production in patients of carcinoma prostate.
• Orchidectomy is performed to carry out androgen ablation in the treatment of locally advanced (T3 or T4) disease or of metastatic disease.
• In 1941, prostate cancer was shown to be responsive to such treatment by Charles Huggins, the only urologist to win a Nobel Prize.
• Bilateral orchidectomy, whether total or subcapsular, will eliminate the major source of testosterone production.