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
[{'content': 'Vector for transmission of sleeping sickness ? \nSelect and explain. \nA. Sandfly, B. Black fly, C. Tse-tse fly, D. Hard tick', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Tse-tse fly", 'role': 'assistant'}]