This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Gastrointestinal System Including Diarrhea, Subject name: Pediatrics
The IgA anti TTG (Tissue Transglutaminase) is a sensitive marker for diagnosis of: 
Select and explain. 
A. Celiac Disease, B. Eosinophilic Gastroenteritis, C. Primary Immunodeficiency, D. Crohn's Disease
A: Celiac Disease
Answer: A: Celiac Disease 
Explanation: Celiac disease: specific antibodies comprise- IgA anti TTG Endomysial antibodies Antibodies against deamidated forms of gliadin peptides