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: Microbiology
[{'content': 'A child from Bihar comes with fever. Blood examination shows sheathed microfilaria with nuclei upto tail tip. The diagnosis is - \nSelect and explain. \nA. B. malayi, B. W. bancrofri, C. Loa loa, D. Oncocerca volvulous', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Br. Malayi 'Sheathed microfilaria with nuclei upto the tip' is a feature of Br. Malayi. Note Loa - Loa also has sheathed microfilaria with nuclei up to tail tip, but it is uncommon in India and it does not cause fever. It causes subcutaneous swelling - calabar swelling or fugitive swelling.", 'role': 'assistant'}]