Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body.

Fact 2: Immunology is the study of the immune system.

Given the two facts above, answer the question "What is one thing studied in immunology?" with the following options: 
- illness
 - antigens
 - humanism
 - health
 - philosophy
 - resistance
 - symbology
 - fever


 

  antigens       