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
[{'content': "Macrophages containing large quantities of undigested and partial digested bacteria in the intestine are seen in - \nSelect and explain. \nA. Whipple's disease, B. Amyloidosis, C. Immunoproliferative small intestinal disease, D. Vibrio cholerae infection", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The hallmark of Whipple’s disease is a small intestinal mucosa laden with distended macrophages in the lamia propria.\nThe macrophages contain periodic acid– Schiff (PAS) positive granules and small rod shaped bacilli)', 'role': 'assistant'}]