Please answer the following question: You are presented with the question "what type of antigens does the immune system recognize as foreign to the body?" and the following answer choices: - animals - epidermal - Allergies - negative - dangerous - graptolites - group of atoms - homogenous Now knowing that antigens are molecules that the immune system recognizes as foreign to the body and molecules are a group of atoms, choose the best answer.
A:
group of atoms