Which pesticide is commonly used in public health programmes?

Assertion : Agricultural output increased several times after introduction of $DDT$.
Reason : $DDT$ was the first insecticide used on a wide scale.

Pesticides are chemicals that kill:

Which of the following is not correctly matched?

$A$: Intensive agriculture leads to negative soil pollution.
$R$: It increases useful mineral contents in the top layer of soil.

Which of the following is a carbamate pesticide?