You are presented with the question "what is recognized as foreign to the body by the immune system?" and the following answer choices: 
- h2o
 - HIV
 - SNPs
 - blood
 - organs
 - p53
 - DDT
 - HPV

Now knowing that antigens are molecules that the immune system recognizes as foreign to the body and another such HPV antigen is the E6 antigen, choose the best answer.


 

        HPV 