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
Tropical diseases targeted for research and training by WHO include all except 
Select and explain. 
A. Trypanosomiasis, B. Onchocerciasis, C. Schistosomiasis, D. Filariasis
B: Onchocerciasis
Answer: B: Onchocerciasis 
Explanation: None