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
The Instestinal villi are swollen and distended. There is accumlation of large granular Macrophages, containing material which stains. Strongly with periodic acid Schiff, in the Lamina propria. The most probable condition is - 
Select and explain. 
A. Secondaty steatorrhoe, B. Sprue, C. Coeliac disease, D. Whipple's disease
D: Whipple's disease
Answer: D: Whipple's disease 
Explanation: Ans. is 'd' i.e., Whipple's disease