Fact 1: Passive immunity lasts only as long as the antibodies survive in body fluids.

Fact 2: An antibody is a protein that attaches to an antigen.

Given the two facts above, answer the question "What lasts only as long as the proteins that attach to an antigen survive in body fluids?" with the following options: 
- hospitalization
 - recovery
 - parasites
 - solid, liquid, gas
 - Leptospirosis
 - Allergies
 - resistance
 - passive immunity


 

        passive immunity 