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 insect amongst the following has not developed resistance to DDT? 
Select and explain. 
A. Musca Domestica, B. Phlebotomus species, C. Xenopsylla species, D. Anopheles species
B: Phlebotomus species
Answer: B: Phlebotomus species 
Explanation: Phlebotomus species or sandflies have not yet shown resistance to DDT. Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 627, 629, 630 and 633.