Please answer the following question: Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. Fact 2: Molecules are a group of atoms. Given the two facts above, answer the question "what type of antigens does the immune system recognize as foreign to the body?" with the following options: - animals - epidermal - Allergies - negative - dangerous - graptolites - group of atoms - homogenous
A:
group of atoms