This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
[{'content': 'A 2-yr-old boy presented with abdominal distension, chronic diarrhea, severe anemia and failure to thrive. Which of the following is the investigation of choice? \nSelect and explain. \nA. Anti milk protein antibody, B. Anti endomysial antibody, C. Antinuclear antibody, D. Intestinal biopsy', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Anti endomysial antibody(Ref: Nelson's 20/e p 1835-1837)The given clinical features suggest a diagnosis of Celiac diseaseAnti Endomysial antibody (anti EMA) & Anti tissue transglutaminase (anti TTG) antibody help in diagnosis of Celiac disease.", 'role': 'assistant'}]