This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Most specific antibody for celiac disease in patients with IgA deficiency \nSelect and explain. \nA. Anti - endomyseal, B. Anti - tissue transglutaminase, C. Anti - reticulin, D. Anti - Gliadin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most specific - Anti - TTG\nMost specific in IGA deficiency - Anti - Gliadin.', 'role': 'assistant'}]