**Core Concept**
The **vitellointestinal duct** is an embryological structure that connects the yolk sac to the midgut. Persistence of this duct can lead to various anomalies.

**Why the Correct Answer is Right**
The correct answer is related to the persistence of the distal part of the vitellointestinal duct, which can form a **Meckel's diverticulum**. This occurs when the distal portion of the duct fails to obliterate during embryonic development.

**Why Each Wrong Option is Incorrect**
**Option A:** Not directly related to the persistence of the vitellointestinal duct.
**Option B:** Not a common anomaly associated with the vitellointestinal duct.
**Option C:** Not the most common result of the persistence of the distal part of the duct.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Meckel's diverticulum** is a true diverticulum, containing all layers of the intestinal wall, and is a common cause of gastrointestinal bleeding in children.

**Correct Answer:** D. Meckel's diverticulum.