**Core Concept**
The question is testing the relationship between *Helicobacter pylori (H. pylori)* infection and various gastrointestinal disorders. H. pylori is a bacterium that causes chronic inflammation of the stomach lining, leading to conditions like gastritis, peptic ulcers, and an increased risk of gastric cancer. The correct answer requires identifying a condition where H. pylori infection is not a common cause.

**Why the Correct Answer is Right**
*H. pylori* is a well-established cause of peptic ulcers, gastritis, and gastric cancer. However, in the case of **Inflammatory Bowel Disease (IBD)**, such as Crohn's disease and ulcerative colitis, the primary cause is an abnormal immune response to the gut microbiota, rather than H. pylori infection. This is because IBD is characterized by chronic inflammation and ulceration of the gastrointestinal tract, which is not typically associated with H. pylori infection.

**Why Each Wrong Option is Incorrect**
* **Option A:** Peptic ulcers are a common complication of H. pylori infection, so this option is incorrect.
* **Option B:** Gastritis, particularly chronic gastritis, is often caused by H. pylori infection, making this option incorrect.
* **Option D:** Gastric cancer is associated with H. pylori infection, especially in developing countries, so this option is also incorrect.

**Clinical Pearl / High-Yield Fact**
Always remember that H. pylori infection is a common cause of peptic ulcers and gastritis, but not typically associated with Inflammatory Bowel Disease.

**Correct Answer:** C.