Which of the following pairs is not correctly matched?

Which group of diseases is spread by mosquito bites?

State whether true or false :
$(1)$ Gastrointestinal tract,kidney and heart also produce hormones.
$(2)$ Pars distalis produces six trophic hormones.
$(3)$ $B$-lymphocytes provide cell-mediated immunity.
$(4)$ Insulin resistance results in a disease called diabetes mellitus.

Bulimia is a type of psychosis,which means . . . . . . .

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

Find the correct match.