## Core Concept
Meckel's diverticulum is a congenital diverticulum of the small intestine, which arises from the incomplete closure of the omphalomesenteric duct (also known as the vitelline duct) during embryonic development. This duct connects the midgut to the yolk sac. The typical location of Meckel's diverticulum is within 2 feet of the ileocecal junction.

## Why the Correct Answer is Right
The correct answer relates to the characteristics of Meckel's diverticulum. A true statement about Meckel's diverticulum includes that it is a remnant of the omphalomesenteric duct, it usually contains ectopic gastric or pancreatic tissue, and it is located on the antimesenteric border of the ileum.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, a Meckel's diverticulum is a true diverticulum, containing all layers of the intestinal wall, and it often includes ectopic mucosa, which can lead to complications like gastrointestinal bleeding.
- **Option B:** Usually, it is located on the antimesenteric border of the ileum, about 2 feet from the ileocecal junction, which makes this statement potentially correct and not the one we're looking for as incorrect.
- **Option C:** Often contains ectopic gastric or pancreatic tissue, which can cause complications, making this a true statement.
- **Option D:** The statement that it is a remnant of the omphalomesenteric duct is true.

## Clinical Pearl / High-Yield Fact
A key clinical 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 often presents with complications in the first 2 years of life or after the age of 50.

## Correct Answer: D.