Which of the following is not DDT resistant?

DDT functions by binding to a specific matching site on the membrane of the insect's nerve cells. When a ceain level of DDT binds to the nerve cell membrane, the nervous system no longer is able to function properly. As a result, the insect dies. Any mutation that adversely affects the binding of DDT to the nerve cell, if it is not lethal or almost lethal, has the potential of conferring DDT resistance to the insect. The other side is that the mutation also interferes with the ability of the cell to bind to other products, causing it to be less effective.