## Core Concept
Meckel's diverticulum is a congenital diverticulum 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 located on the antimesenteric border of the ileum. The presence of ectopic gastric or pancreatic tissue within the diverticulum can lead to complications.

## Why the Correct Answer is Right
The correct answer, option D, states that Meckel's diverticulum is not usually symptomatic. This is generally true as most Meckel's diverticula are asymptomatic and found incidentally during imaging or surgery for other reasons. However, when complications arise, they can include gastrointestinal bleeding, intestinal obstruction, and diverticulitis.

## Why Each Wrong Option is Incorrect
- **Option A:** True statements about Meckel's diverticulum include that it is a remnant of the vitelline duct and can contain ectopic gastric mucosa, which can cause peptic ulceration and bleeding.
- **Option B:** It is indeed located on the antimesenteric border of the ileum, approximately 2 feet from the ileocecal junction.
- **Option C:** Complications can include bleeding, obstruction, and inflammation (diverticulitis), making these statements true.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is the "rule of twos" often associated with Meckel's diverticulum: it is usually found within 2 feet of the ileocecal junction, and complications often present in the first 2 years of life. However, it can present at any age.

## Correct Answer Line
**Correct Answer: D.**