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 has diarrhea, malabsorption,  Abdominal pain and Arthralgia. On intestinal biopsy PAS + organisms present inside macrophage. Most likely diagnosis is 
Select and explain. 
A. Celiac sprue, B. Whipple's disease, C. Zollinger - ellison syndrome, D. Chron's disease
B: Whipple's disease
Answer: B: Whipple's disease 
Explanation: PAS+ Organisms inside macrophage clearly s/o whipple's disease.