You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which insect amongst the following has not developed resistance to DDT? and explain in detail?
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.