Which insect amongst the following has not developed resistance to DDT?: (A) Musca Domestica, (B) Phlebotomus species, (C) Xenopsylla species, (D) Anopheles species
Answer is B. 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.