**Core Concept**
Peutz-Jegher's syndrome is a rare genetic disorder characterized by the development of benign hamartomatous polyps in the gastrointestinal tract and an increased risk of certain cancers. The polyps are associated with mutations in the STK11 gene, leading to dysregulation of cell growth and division.

**Why the Correct Answer is Right**
The polyps in Peutz-Jegher's syndrome are typically found in the small intestine, but they can also occur in the large intestine, stomach, and other parts of the gastrointestinal tract. The polyps are hamartomatous, meaning they are composed of a mixture of normal tissue elements in an abnormal arrangement. The STK11 gene plays a crucial role in regulating cell growth and division, and mutations in this gene lead to the development of these polyps.

**Why Each Wrong Option is Incorrect**
**Option A:** While gastrointestinal polyps are a hallmark of Peutz-Jegher's syndrome, the polyps are not typically found in the liver, which is a key distinction between this condition and other diseases.
**Option B:** Although the polyps in Peutz-Jegher's syndrome can cause gastrointestinal symptoms, they do not typically lead to the development of pancreatic cancer, which is more commonly associated with other genetic syndromes.
**Option C:** While the polyps in Peutz-Jegher's syndrome can be found in the stomach, this is not the most common location, and the syndrome is not characterized by gastric polyps alone.

**Clinical Pearl / High-Yield Fact**
A key feature of Peutz-Jegher's syndrome is the presence of mucocutaneous melanin deposits, which can be seen as blue or blue-black spots on the skin and mucous membranes. This finding can be a helpful diagnostic clue in patients with suspected Peutz-Jegher's syndrome.

**Correct Answer:** C.