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: Pathology
Villous atrophy is seen in - 
Select and explain. 
A. Celiac disease, B. Giardiasis, C. Tropical sprue, D. All of above
D: All of above
Answer: D: All of above 
Explanation: None