## **Core Concept**
Acquired diverticula, also known as pseudodiverticula, are outpouchings of the mucosa and submucosa through weak points in the muscular layer of the intestine, most commonly seen in the **sigmoid colon**. This condition often results from increased intraluminal pressure and weakening of the colonic wall.

## **Why the Correct Answer is Right**
The correct answer, **sigmoid colon**, is the most common site for acquired diverticula due to several factors:
- High intraluminal pressures
- Low luminal diameter
- Weak points in the muscular layer where the blood vessels penetrate

## **Why Each Wrong Option is Incorrect**
- **Option A:** While diverticula can occur in other parts of the colon, such as the **ascending colon**, this is less common compared to the sigmoid colon, particularly in Western populations.
- **Option B:** The **descending colon** can also be a site for diverticula but is less frequently involved than the sigmoid colon.
- **Option C:** **Jejunum** is more commonly associated with **true diverticula** or congenital diverticula, which are less common than acquired diverticula.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that acquired diverticulosis is very common in older adults, especially in populations with a Western diet. It is often found incidentally during imaging studies. A classic clinical correlation is that patients with diverticulosis may present with **left lower quadrant pain** if diverticulitis occurs, which is inflammation of the diverticula.

## **Correct Answer:** D. Sigmoid colon.