**Core Concept**
Modified RPLND (Retroperitoneal Lymph Node Dissection) is a surgical procedure used to treat non-seminomatous germ cell tumors (NSGCTs) of the testis. It involves the removal of lymph nodes in the retroperitoneum, where cancer cells are likely to have spread. This procedure can lead to various complications due to its invasive nature and the sensitive anatomy involved.

**Why the Correct Answer is Right**
The correct answer involves a known complication of modified RPLND. One of the significant risks associated with this procedure is the damage to the sympathetic nerves, which can lead to **ejaculatory dysfunction**. This occurs because the sympathetic nerves responsible for ejaculation run close to the lymph nodes in the retroperitoneum and are often injured during the surgical dissection. The interruption of these nerves can result in an inability to ejaculate, which is a significant quality-of-life issue for affected patients.

**Why Each Wrong Option is Incorrect**
* **Option A:** Orchidectomy (removal of the testis) is a separate surgical procedure performed for testicular cancer, but it is not a complication of modified RPLND.
* **Option B:** Hemorrhage is a potential complication of any major surgery, but it is not a specific or unique complication of modified RPLND.
* **Option D:** Lymphedema is a possible complication of RPLND, but it is more commonly associated with the removal of lymph nodes in the groin (inguinal lymphadenectomy) rather than the retroperitoneum.

**Clinical Pearl / High-Yield Fact**
It's essential for surgeons and urologists to carefully balance the benefits of modified RPLND with the risks of potential complications, including ejaculatory dysfunction, to ensure the best possible outcomes for patients with NSGCTs.

**Correct Answer:** C. Ejaculatory dysfunction is a known complication of modified RPLND done for non-seminomatous germ cell tumour of testis.