This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'River blindness is caused by \nSelect and explain. \nA. Onchocerca, B. Loa loa, C. Ascaris, D. Brugia malayi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Onchocerciasis is also known as River blindness and Robles disease. REF : paniker book of parasitology 8th Ed.', 'role': 'assistant'}]