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
Which of the following is the first proven vector of a virus disease? 
Select and explain. 
A. Aedes aegypti, B. Anopheles stephensi, C. Anopheles culicifacies, D. Culex fatigans
A: Aedes aegypti
Answer: A: Aedes aegypti 
Explanation: Aedes aegypti has an impoant position in the history of preventive medicine. It is the first proved vector of a viral disease. It causes yellow fever. Chapter: Environment and health Ref: Park 21st edition page: 711