You are presented with the question "What are molecules that the immune system recognizes as foreign to the body?" and the following answer choices: - Foreign country. - Carbohydrates, or proteins. - microorganisms - Something that causes allergies - Molecular structure. - Operating system. - sub-units of species - Organic compounds Now knowing that antigens are molecules that the immune system recognizes as foreign to the body and an antigen is a molecule of carbohydrate or protein, choose the best answer.
The answer to this question is:
Carbohydrates, or proteins.