This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
Sandfly acts as a vector to all of the following diseases, EXCEPT 
Select and explain. 
A. Oriental sore, B. Oraya fever, C. Kala-azar, D. Onchocerciasis
D: Onchocerciasis
Answer: D: Onchocerciasis 
Explanation: (D) Onchocerciasis