## **Core Concept**
The use of DEC (diethylcarbamazine) medicated salt is a strategy employed in the control and elimination of lymphatic filariasis, particularly in endemic areas. DEC is a filarial microfilaricide that, when given in low doses over a prolonged period, can help reduce the transmission of filariasis by killing the microfilariae in the bloodstream.

## **Why the Correct Answer is Right**
The correct concentration of diethylcarbamazine in DEC medicated salt used in endemic filariasis areas is **2-3 grams per kilogram of salt**. This concentration is effective for reducing microfilarial loads in the population without causing significant side effects. The addition of DEC to salt is a public health measure aimed at communities where lymphatic filariasis is endemic, helping to control the spread of the disease.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This concentration seems too low to be effective in controlling filariasis.
- **Option B:** Although closer, this option does not match the commonly recommended concentration for DEC in medicated salt.
- **Option D:** This option seems excessively high and could potentially lead to toxicity.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the use of DEC medicated salt is just one part of a comprehensive strategy to eliminate lymphatic filariasis, which also includes mass drug administration (MDA) of antifilarial drugs, vector control, and management of chronic disease.

## **Correct Answer:** .