Antigens are molecules that the immune system recognizes as foreign to the body, and an antigen is a molecule of carbohydrate or protein. Given these facts, what are molecules that the immune system recognizes as foreign to the body among the following options:
- Foreign country.
 - Carbohydrates, or proteins.
 - microorganisms
 - Something that causes allergies
 - Molecular structure.
 - Operating system.
 - sub-units of species
 - Organic compounds


 

  Carbohydrates, or proteins.       