**Core Concept**
Vasectomy is a surgical procedure for male sterilization, involving the occlusion of the vas deferens to prevent sperm from reaching the ejaculate. This is achieved by severing or clipping the vas deferens, followed by an occlusive procedure to prevent sperm from leaking through the transected ends.

**Why the Correct Answer is Right**
The correct answer is based on the understanding of the vasectomy procedure and its effects on sperm. Vasectomy is a highly effective method of male sterilization, with a failure rate of less than 1% if performed correctly. The procedure involves cutting the vas deferens, which is the duct that carries sperm from the testes to the prostate. After vasectomy, sperm are still produced in the testes but are trapped and eventually absorbed by the body. The occlusive procedure is crucial to prevent sperm from leaking through the transected ends, thereby ensuring that no sperm are present in the ejaculate.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because vasectomy does not involve the removal of the testes. The testes continue to produce sperm, which are then trapped and absorbed by the body after the vasectomy procedure.

**Option B:** Incorrect because vasectomy is a highly effective method of male sterilization, with a failure rate of less than 1% if performed correctly. The procedure involves cutting the vas deferens, which is the duct that carries sperm from the testes to the prostate.

**Option C:** Incorrect because vasectomy does not involve the removal of the epididymis. The epididymis is a tube-like structure that stores and transports sperm from the testes to the vas deferens.

**Clinical Pearl / High-Yield Fact**
A common complication of vasectomy is post-vasectomy sperm granuloma, which is a small, painful lump that forms at the site of the vasectomy. This is usually caused by sperm leaking through the transected ends of the vas deferens and causing an inflammatory reaction.

**Correct Answer: B. Vasectomy involves cutting the vas deferens, which is the duct that carries sperm from the testes to the prostate.**