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': 'Hydrocele and edema in foot occur in: \nSelect and explain. \nA. W. Bancrofti, B. B. Malayi, C. B. Timori, D. Oncocerca', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) W. Boncrofti', 'role': 'assistant'}]