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: Medicine
Main Vector in urban malaria 
Select and explain. 
A. A. Culicifacies, B. A. Stephensi, C. A. Fluviatilis, D. A. Epiroticus
B: A. Stephensi
Answer: B: A. Stephensi 
Explanation: A. Culicifacies - Main vector in rural areas.
A. Stephensi - Main vector in urban areas.