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': 'One of the following microfilaria does not posses nuclei upto tail tip - \nSelect and explain. \nA. W. bancrofti, B. Loa- Loa, C. M. perstons, D. B. malayi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]