**Core Concept**
The patient has undergone retroperitoneal lymph node dissection (RPLND) for embryonal carcinoma of the testis, leading to potential damage to the vas deferens and seminal vesicles, resulting in ejaculatory duct obstruction and azoospermia. The semen analysis confirms the absence of sperm and fructose, indicating a blockage in the ejaculatory ducts.

**Why the Correct Answer is Right**
Microtesticular aspiration and intracytoplasmic sperm injection (ICSI) is a suitable treatment option for this patient. The procedure involves aspirating sperm directly from the testis, which is then injected into the egg using ICSI. Since the patient has normal spermatogenesis, but the sperm is not being ejaculated due to the blockage, this procedure allows for the direct retrieval and use of sperm for fertilization. This approach bypasses the need for a functional vas deferens and seminal vesicles, making it an effective option for patients with ejaculatory duct obstruction.

**Why Each Wrong Option is Incorrect**
**Option A:** Artificial insemination of donor sperm is not the best option in this case, as the patient's wife may not wish to use donor sperm, and this approach does not address the underlying issue of ejaculatory duct obstruction.

**Option B:** Penile prosthesis is not relevant to the treatment of infertility due to ejaculatory duct obstruction and is typically used for erectile dysfunction.

**Option D:** None of the above is incorrect, as microtesticular aspiration and ICSI is a viable treatment option for this patient.

**Clinical Pearl / High-Yield Fact**
In cases of ejaculatory duct obstruction, microtesticular aspiration and ICSI can be an effective treatment option, even when other fertility treatments fail. This highlights the importance of considering individualized treatment plans for patients with complex fertility issues.

**Correct Answer Line**
✓ Correct Answer: C. Microtesticular aspiration and intracyto plasmic injection.