What is responsible for the resistance of insects to insecticides?

Assertion: Cocaine has a potent stimulating action on the central nervous system,producing a sense of euphoria and increased energy.
Reason: Injecting the microbes intentionally during immunisation or infectious organisms gaining access into the body during natural infection induces active immunity.

Identify the mosquito that is currently widely found as a disease vector in India.

In the given diagram of the life cycle of Plasmodium in the mosquito,what does the part labeled '$a$' represent?

Identify the correct match:

$(a)$	$(b)$	$(c)$
$1$. Typhoid	$a$. Virus	$P$. Nose
$2$. Malaria	$b$. Bacteria	$Q$. Liver cells
$3$. Common cold	$c$. Protozoans	$R$. Small intestine

$S -$ Statement: Cancer is a deadly infectious disease.
$R -$ Reason: $AIDS$ was first reported in the $USA$ in $1986$.