**Core Concept**
Total Mesorectal Excision (TME) is a surgical technique used to treat rectal cancer. It involves the removal of the mesorectum, which is the fatty tissue surrounding the rectum, along with the rectal cancer. This approach aims to eliminate the risk of local recurrence by removing the entire mesorectal fascia.

**Why the Correct Answer is Right**
The key principle behind TME is to meticulously dissect and remove the mesorectum, including the mesorectal fascia. This is achieved by identifying the plane between the mesorectum and the surrounding pelvic structures, such as the sacrum and the levator ani muscles. The surgeon must then carefully dissect the mesorectum from these structures, taking care not to damage the rectal nerve or the autonomic nerves. By removing the entire mesorectum, TME aims to reduce the risk of local recurrence and improve oncologic outcomes.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because TME is not typically performed for rectal cancer with distant metastases. In such cases, the focus is on systemic treatment rather than surgical resection.
* **Option B:** This option is incorrect because TME is not a substitute for neoadjuvant chemoradiation. While TME is an essential component of rectal cancer surgery, neoadjuvant treatment is often used to shrink the tumor and make it easier to remove.
* **Option C:** This option is incorrect because TME is not a technique used to treat anal cancer. While anal cancer is a type of gastrointestinal cancer, the surgical approach for anal cancer is different from that for rectal cancer.

**Clinical Pearl / High-Yield Fact**
TME is a technically demanding procedure that requires a high level of surgical expertise. The key to successful TME is meticulous dissection and the ability to identify the correct planes between the mesorectum and surrounding structures.

**Correct Answer: D**.