You are presented with the question "What are molecules that the immune system recognizes as foreign to the physical entity?" and the following answer choices: 
- bacteria
 - proteins
 - antibodies
 - Allergies
 - negative
 - immunities
 - parasites
 - antigens

Now knowing that antigens are molecules that the immune system recognizes as foreign to the body and bodies are physical entities, choose the best answer.


 

        antigens 