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': 'A patient presents with subcutaneou nodules over Rt. iliac crest. Lymph node as well as skin smear shows microfilariae. Patient also has eye manifestatons .Most common filarial species involved - \nSelect and explain. \nA. Brugis timori, B. Onchocerca volvulus, C. Loa Loa, D. Mansonelle ozaradi', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]