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
[{'content': "Which of the following is a histological feature of Whipple's disease - \nSelect and explain. \nA. Infiltration of histocytes in the lamina propria, B. Granuloma in the lamina, C. Macrophages with PAS (+) material inside the lamina propria, D. Eosinophils in the lamina propria", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]