**Question:** Recurrebt polyps are seen in:

A. Peutz-Jeghers syndrome
B. Familial adenomatous polyposis (FAP)
C. Gardner syndrome
D. Hypertrophic pyloric stenosis

**Core Concept:**
Recurrent polyps are a group of benign (non-cancerous) growths that can form in the gastrointestinal tract. These polyps can be further categorized into two types based on their genetic background: hereditary and non-hereditary. Hereditary polyps are associated with specific genetic syndromes, while non-hereditary polyps can occur sporadically.

**Why the Correct Answer is Right:**
Recurrent polyps, particularly in the context of this question, refer to non-hereditary polyps. In this case, the correct answer is:

D. Hypertrophic pyloric stenosis (HPS) is a non-hereditary condition that affects infants and is characterized by inflammation and thickening of the pyloric muscles, causing obstruction of the stomach outlet. This question is asking about non-hereditary polyps, which is Option D.

**Why Each Wrong Option is Incorrect:**
A. Peutz-Jeghers syndrome (PJS) is a hereditary disorder characterized by mucocutaneous pigmentation and polyps in the gastrointestinal tract, excluding the rectum. PJS is associated with mutations in the STK11 gene and is inherited in an autosomal dominant manner.

B. Familial adenomatous polyposis (FAP) is a hereditary disorder characterized by the development of multiple adenomatous polyps in the colon and rectum, often leading to colorectal cancer. FAP is caused by mutations in the APC gene and is inherited in an autosomal dominant manner.

C. Gardner syndrome is a hereditary disorder characterized by the development of multiple colorectal polyps, skin lesions, and osteomas. Gardner syndrome is associated with mutations in the APC gene and is inherited in an autosomal dominant manner.

**Clinical Pearl:**
Hereditary polyps, such as in A, B, and C, are associated with specific genetic syndromes (e.g., FAP, Gardner syndrome) and involve polyps in the colon and rectum, while non-hereditary polyps, like Option D (HPS), are not associated with specific genetic syndromes and affect other parts of the gastrointestinal tract, excluding the rectum.