The headquarters of the $WHO$ is located at:

The spleen is a:

Degenerative diseases are those which develop due to

The drug used for diarrhea and piles is ...... .

Statement $I$: $ELISA$ works on the principle of antigen-antibody interaction.
Statement $II$: Infection by a pathogen can be detected by the presence of antigens or by detecting the antibodies synthesized against the pathogen.

The virus causing conjunctivitis spreads from one person to another through the air. Therefore,conjunctivitis is a: