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

Fact 2: Another such HPV antigen is the E6 antigen.

Given the two facts above, answer the question "what is recognized as foreign to the body by the immune system?" with the following options: 
- h2o
 - HIV
 - SNPs
 - blood
 - organs
 - p53
 - DDT
 - HPV


 

        HPV 