This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'Sheathed microfilaria is/are - \nSelect and explain. \nA. W. Bancrofti, B. Loa-loa, C. M. Perstans, D. B. Malayi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Covered by hyaline sheath The sheath is much longer than the embryo so that microfilaria can move forward and backward with in it . (refer pgno:165 baveja 3 rd edition)', 'role': 'assistant'}]