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: Social & Preventive Medicine
Black fly Transits 
Select and explain. 
A. Filaria, B. Onchocerciasis, C. Changes disease, D. Oroya fever
B: Onchocerciasis
Answer: B: Onchocerciasis 
Explanation: None