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
Vector for transmission of sleeping sickness ? 
Select and explain. 
A. Sandfly, B. Black fly, C. Tse-tse fly, D. Hard tick
C: Tse-tse fly
Answer: C: Tse-tse fly 
Explanation: Ans. is 'c' i.e., Tse-tse fly