## **Core Concept**
Third-degree hemorrhoids are characterized by their prolapse during defecation, requiring manual reduction. The treatment aims to eliminate symptoms, prevent complications, and address the prolapse.

## **Why the Correct Answer is Right**
The correct answer, **D. Excision (or hemorrhoidectomy)**, is considered the treatment of choice for third-degree hemorrhoids because it directly addresses the prolapse and removes the hemorrhoidal tissue. This surgical approach provides a definitive solution by excising the prolapsed hemorrhoids, thereby reducing the risk of complications such as thrombosis, strangulation, and recurrent prolapse.

## **Why Each Wrong Option is Incorrect**
- **Option A: Rubber band ligation** is more commonly used for first- and second-degree hemorrhoids. While it can be used for early-stage third-degree hemorrhoids, it's generally not the preferred method for more advanced cases due to a higher risk of recurrence and the need for manual reduction.
- **Option B: Sclerotherapy** involves injecting a sclerosing agent into the hemorrhoid to shrink it. This method is usually effective for smaller, less prolapsed hemorrhoids and is not suitable for third-degree hemorrhoids due to the significant prolapse.
- **Option C: Infrared photocoagulation** is another method used for smaller hemorrhoids. It works by applying infrared radiation to coagulate and shrink the hemorrhoidal tissue. However, it's not effective for larger, prolapsed hemorrhoids like those found in third-degree cases.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the degree of hemorrhoid prolapse guides the treatment approach. Third-degree hemorrhoids require intervention that directly addresses the prolapse, making **hemorrhoidectomy** the gold standard. A useful mnemonic is not directly applicable here, but recalling that "first-degree" hemorrhoids don't prolapse, "second-degree" do but reduce spontaneously, and "third-degree" require manual reduction helps in decision-making.

## **Correct Answer: D. Excision (or hemorrhoidectomy)**