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: Medicine
[{'content': 'Kallu a 30-year-old man, presented with subcutaneous itchy nodules over the left iliac crest. On examination, they are firm, non-tender and mobile. Skin scrapping contains microfilaria and adults worms of- \nSelect and explain. \nA. Loa Loa, B. Onchocerca volvulus, C. Brugia malayi, D. Mansonella persutans', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]