**Question:** Proved association of Celiac disease is with

A. HLA-DQ2
B. Gluten consumption
C. Eosinophilic esophagitis
D. Irritable bowel syndrome

**Correct Answer:** A. HLA-DQ2

**Core Concept:**
Celiac disease is a chronic autoimmune disorder triggered by the ingestion of gluten, a protein found in wheat, barley, and rye. In genetically susceptible individuals, gluten exposure leads to an immune response that damages the small intestine's mucosal lining, impairing its absorption function.

**Why the Correct Answer is Right:**
HLA-DQ2 is a specific HLA (human leukocyte antigen) haplotype commonly found in individuals with celiac disease. The association between HLA-DQ2 and celiac disease is well-established and helps identify individuals at risk of developing the disease. When gluten is consumed by an HLA-DQ2 positive individual, the immune system mounts an attack on the small intestine, resulting in the characteristic damage seen in celiac disease.

**Why Each Wrong Option is Incorrect:**

A. Gluten consumption (Option B) is correct but doesn't explain the genetic predisposition. HLA-DQ2 is the genetic marker that significantly increases the risk of developing celiac disease upon gluten exposure.

B. Eosinophilic esophagitis (Option C) is a gastrointestinal disorder characterized by eosinophil infiltration in the esophagus, often caused by food allergens or irritants, not directly related to celiac disease.

D. Irritable bowel syndrome (Option D) is a functional gastrointestinal disorder characterized by abdominal pain, bloating, and altered bowel habits, unrelated to celiac disease.

**Clinical Pearl:**
Understanding the relationship between HLA-DQ2, gluten exposure, and celiac disease is crucial for diagnosing and managing patients with suspected celiac disease. It helps identify individuals who need to adopt a gluten-free diet to prevent further damage to the small intestine and associated complications.