**Core Concept**
Meckel's diverticulum is a congenital anomaly of the small intestine, resulting from the incomplete closure of the vitelline duct. It is a true diverticulum, containing all layers of the intestinal wall, and is usually found on the antimesenteric border of the ileum. The presence of a wide mouth Meckel's diverticulum increases the risk of complications such as bleeding, obstruction, and infection.

**Why the Correct Answer is Right**
The treatment of choice for a wide mouth Meckel's diverticulum, found incidentally during laparotomy, is surgical resection. This is because the risk of complications associated with a wide mouth diverticulum outweighs the risks of surgery. The procedure involves removing the Meckel's diverticulum and a portion of the surrounding intestine to prevent recurrence. The surgical approach is usually a simple resection of the diverticulum, and the intestine is then closed with sutures or staples.

**Why Each Wrong Option is Incorrect**
**Option A:** Conservative management is not recommended for a wide mouth Meckel's diverticulum, as it increases the risk of complications.

**Option B:** Endoscopic removal is not feasible for Meckel's diverticulum, as it is a true diverticulum containing all layers of the intestinal wall.

**Option C:** Observation alone is not sufficient, as the risk of complications associated with a wide mouth diverticulum outweighs the risks of surgery.

**Clinical Pearl / High-Yield Fact**
A wide mouth Meckel's diverticulum is a significant finding that requires surgical resection to prevent potential complications.

**Correct Answer: C. Surgical resection is the treatment of choice for a wide mouth Meckel's diverticulum found incidentally during laparotomy.**