**Core Concept**
Subcapsular orchiectomy is a surgical procedure that involves the removal of the inner part of the testicle, leaving the outer fibrous layer intact. This procedure is often performed in the context of hormone management in patients with certain cancers.

**Why the Correct Answer is Right**
In the management of prostate cancer, subcapsular orchiectomy is a method to reduce testosterone levels, which can promote the growth of prostate cancer cells. The testes are responsible for producing testosterone, and by removing the inner part of the testicle, the production of testosterone is significantly decreased. This approach is particularly useful in patients with advanced prostate cancer who are not candidates for other forms of hormone therapy or have developed resistance to medical therapy. The procedure can help slow the progression of the disease and alleviate symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Ca testis (testicular cancer) is typically managed with orchiectomy, but a radical orchiectomy is performed, which involves the removal of the entire testicle, not just the inner part.
**Option C:** Ca penis and **Option D:** Ca urethra are not typically managed with subcapsular orchiectomy, as they are not hormone-sensitive cancers.

**Clinical Pearl / High-Yield Fact**
When considering surgical options for hormone management in prostate cancer, it's essential to remember that subcapsular orchiectomy can lead to a significant decrease in testosterone levels, potentially causing side effects such as hot flashes, gynecomastia, and osteoporosis. This should be taken into account when counseling patients regarding this treatment option.

**✓ Correct Answer: B. Ca prostate**