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': "Which of the following is not true regarding Whipple's Disease ? \nSelect and explain. \nA. Bacteria laden macrophages are present in lymphatic system., B. It has autoimmune etiology., C. PAS positive diastase resistant granules are present., D. Foamy macrophages are characteristics .", 'role': 'user'}, {'content': "Answer: B \nExplanation: Whipple's disease is caused by Gram positive actinomycete Tropheryma whipplei.", 'role': 'assistant'}]