**Core Concept**
Irritable Bowel Syndrome (IBS) is a functional gastrointestinal disorder characterized by recurring abdominal pain, changes in bowel habits, and bloating. The pathophysiology of IBS involves a complex interplay of altered gut motility, hypersensitivity to food and stress, and altered gut microbiota.

**Why the Correct Answer is Right**
The correct answer will not be one of the typical symptoms or characteristics of IBS. IBS is often associated with abdominal pain, changes in bowel habits (diarrhea or constipation), and bloating. These symptoms are often accompanied by psychological comorbidities such as anxiety and depression.

**Why Each Wrong Option is Incorrect**
**Option A:** Abdominal pain is a hallmark symptom of IBS, often described as crampy, episodic, and relieved by defecation.
**Option B:** Changes in bowel habits, such as diarrhea or constipation, are common in IBS patients and can be triggered by various factors including stress, food, and hormonal changes.
**Option C:** Bloating is a common symptom of IBS, often accompanied by gas and discomfort.

**Clinical Pearl / High-Yield Fact**
IBS patients often exhibit altered gut motility, which can be measured using techniques such as manometry. This can help differentiate IBS from other gastrointestinal disorders such as inflammatory bowel disease.

**Correct Answer:** D.