**Core Concept**
Synthetic pyrethroids are a class of insecticides that mimic the natural insecticides found in the flowers of the Chrysanthemum cinerariaefolium plant. They work by disrupting the normal functioning of the insect nervous system, ultimately leading to the insect's death.

**Why the Correct Answer is Right**
Synthetic pyrethroids, such as permethrin, deltamethrin, and cypermethrin, work by inhibiting the action of voltage-gated sodium channels in the insect nervous system. This results in a persistent activation of the nervous system, leading to muscle contractions, paralysis, and eventually death. The correct answer is not a synthetic pyrethroid compound, and therefore, it does not work through this mechanism.

**Why Each Wrong Option is Incorrect**
**Option A:** Permethrin is a well-known synthetic pyrethroid compound, making it incorrect as the correct answer.
**Option B:** Deltamethrin is another synthetic pyrethroid compound, so it is also incorrect.
**Option C:** Cypermethrin is a synthetic pyrethroid compound as well, making it an incorrect choice.

**Clinical Pearl / High-Yield Fact**
It's worth noting that synthetic pyrethroids are generally considered to be safe for humans and the environment, but they can still cause skin and eye irritation in some individuals.

**Correct Answer: D. [Answer Text]**