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
To prevent Yellow Fever Aedes aegypti index should be less than 
Select and explain. 
A. 0.50%, B. 1%, C. 2%, D. 5%
B: 1%
Answer: B: 1% 
Explanation: 1%