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
A patient presents with chronic small bowel diarrhea, duodenal biopsy shows villous atrophy. Anti-endomysial antibodies and IgA TTG antibodies are positive. What is the treatment of choice? 
Select and explain. 
A. Gluten free diet, B. Antibiotics, C. Loperamide, D. 5-ASA
A: Gluten free diet
Answer: A: Gluten free diet 
Explanation: None