## **Core Concept**
A true diverticulum is a pouch or sac that includes all layers of the wall of the organ from which it protrudes. This condition can occur in various parts of the gastrointestinal tract and is characterized by the presence of all the layers of the organ wall in the diverticulum.

## **Why the Correct Answer is Right**
The correct answer, **C. True diverticulum contains all layers of the intestinal wall**, is right because a true diverticulum, by definition, involves all layers of the intestinal wall. This is in contrast to a false or pseud diverticulum, which does not include all layers of the wall. True diverticula are less common and can be found in conditions such as Meckel's diverticulum, which is a congenital anomaly.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately describe a true diverticulum.
- **Option B:** This option is incorrect as it likely describes a characteristic not specific to true diverticula or is incomplete.
- **Option D:** This option is incorrect because it does not accurately represent the defining feature of a true diverticulum.

## **Clinical Pearl / High-Yield Fact**
A classic example of a true diverticulum is **Meckel's diverticulum**, which is a congenital diverticulum of the small intestine. It is a remnant of the vitelline duct and can contain gastric or pancreatic tissue, leading to complications like gastrointestinal bleeding.

## **Correct Answer:** C. True diverticulum.