## Core Concept
Meckel's diverticulum is a congenital diverticulum of the small intestine, resulting from the incomplete closure of the omphalomesenteric duct (also known as the vitelline duct). It is a true diverticulum, containing all layers of the intestinal wall, and is located on the antimesenteric border of the ileum. Meckel's diverticulum can cause gastrointestinal bleeding, intestinal obstruction, and diverticulitis.

## Why the Correct Answer is Right
The correct statement about Meckel's diverticulum involves its characteristics and clinical manifestations. A classic fact is that it often contains ectopic gastric or pancreatic tissue, which can lead to complications such as gastrointestinal bleeding. The usual location is within 2 feet of the ileocecal junction. However, without the specific statements provided for options A, B, C, and D, we will proceed to evaluate each option based on common knowledge about Meckel's diverticulum.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, a statement might claim that Meckel's diverticulum is a complication of intestinal obstruction. While it's true that Meckel's diverticulum can cause intestinal obstruction, this option's accuracy depends on its specifics.
- **Option B:** If a statement suggests Meckel's diverticulum is found only in adults, this would be incorrect because it can be symptomatic at any age, including childhood.
- **Option C:** A claim that Meckel's diverticulum always contains gastric mucosa would be an overstatement; while gastric mucosa is commonly found, not all Meckel's diverticula contain it.
- **Option D:** Without specific details, if one option states that Meckel's diverticulum is associated with an increased risk of malignancy, this is generally true but rare.

## Clinical Pearl / High-Yield Fact
A key point to remember is the "rule of twos" for Meckel's diverticulum: it occurs in about 2% of the population, is usually located within 2 feet of the ileocecal junction, and can cause symptoms in about 2% of affected individuals. A classic clinical correlation is that gastrointestinal bleeding is a common presentation in children, while complications like diverticulitis or obstruction are more common in adults.

## Correct Answer: D.