If  A molecule of carbohydrate or protein molecule the immune system recognizes as foreign to the body, then what are molecules that the immune system recognizes as foreign to the body?

Answer choices:
- Foreign country.
 - Carbohydrates, or proteins.
 - microorganisms
 - Something that causes allergies
 - Molecular structure.
 - Operating system.
 - sub-units of species
 - Organic compounds

 

  Carbohydrates, or proteins.        