Identify the molecules $(A)$ and $(B)$ shown below and select the right option giving their source and use.

Molecule             $\to $         Source                  $\to $                Uses

If interferon is being produced in the body of a sick person, the person is most likely to be suffering form

Epidemiology deals with the study of

Filaria, malaria, dengue fever, sleeping sickness, yellow fever are transmitted by

Full forms : $ELISA$ &$ PCR$