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': 'Microfilariae of the following parasites are found in blood except - \nSelect and explain. \nA. Brugia malayi, B. Loa Loa, C. Onchocerca volvulus, D. Wuchereria bancrofti', 'role': 'user'}, {'content': 'Answer: C \nExplanation: produces onchocerciasis Adult worm may occur in subcutaneous nodules Nodules are painless (refer pgno:173 baveja 3 rd edition)', 'role': 'assistant'}]