**Core Concept**
Pseudopolyps are mucosal lesions that occur in the colon due to chronic inflammation and ulceration. They are a characteristic feature of chronic inflammatory bowel diseases (IBD), particularly in ulcerative colitis (UC).

**Why the Correct Answer is Right**
In ulcerative colitis, pseudopolyps are formed as a result of the healing process of chronic ulceration. The mucosa undergoes a process of denudation, where the epithelial lining is lost, and the underlying submucosa is exposed. This area is then repopulated with a mixture of normal and dysplastic cells, forming a polypoid mass. The surface of these pseudopolyps is often irregular and may contain areas of dysplasia.

**Why Each Wrong Option is Incorrect**
**Option A:** Crohn's disease is another type of IBD that affects the gastrointestinal tract, but it is more likely to cause strictures and fistulas rather than pseudopolyps.

**Option C:** Celiac sprue is an autoimmune disorder that causes malabsorption due to gluten sensitivity. It does not typically cause pseudopolyps in the colon.

**Option D:** Whipple's disease is a rare bacterial infection that affects the small intestine and is characterized by malabsorption and weight loss. It does not typically cause pseudopolyps in the colon.

**Clinical Pearl / High-Yield Fact**
Pseudopolyps in ulcerative colitis are a marker of chronic inflammation and may be associated with an increased risk of colorectal cancer.

**Correct Answer:**
✓ Correct Answer: B. Ulcerative colitis