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': 'In occult filariasis microfilaria are present in ? \nSelect and explain. \nA. Peripheral blood only, B. Peripheral lymph nodes only, C. Deep lymph nodes only, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None' In occult filariasis, microfilariae are present in deep organs and lymphatic tissue but not in blood.", 'role': 'assistant'}]