**Core Concept**
DDT (Dichlorodiphenyltrichloroethane) is a synthetic insecticide that was widely used for pest control, but its use has been largely discontinued due to environmental and health concerns. As a chlorinated hydrocarbon, DDT's mechanism of action involves disrupting normal insect physiology.

**Why the Correct Answer is Right**
The correct answer will relate to the mechanism of action of DDT. DDT affects the nervous system of insects by blocking the GABA-gated chloride channels, leading to an increase in the concentration of glutamate in the insect's nervous system, resulting in hyperexcitability and eventual death. This action is similar to that of certain antiepileptic drugs in humans.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mechanism of action of DDT.
**Option B:** This option is incorrect because it is not a well-known fact about DDT.
**Option C:** This option is incorrect because it is not related to the mechanism of action of DDT.

**Clinical Pearl / High-Yield Fact**
DDT's use has been discontinued due to its persistence in the environment and its impact on human health, particularly its association with cancer and reproductive issues.

**Correct Answer: A. DDT acts by blocking GABA-gated chloride channels in insects.