Which of the following is something your immune system makes to fight disease?

• A. Antibody
• B. Antigen
• C. Enzyme
• D. Hormone

Answer: (A)

Antibodies are proteins made by the immune system (specifically by B cells) to fight disease. They are shaped to recognize and bind to specific antigens on pathogens, neutralizing the invader or tagging it for attack by other immune cells. This targeted, adaptive response also creates memory, helping the body respond faster if the same pathogen appears again. Antigens are foreign substances that trigger the immune response, not something the body makes to fight disease. Enzymes are proteins that speed up chemical reactions, and hormones are signaling molecules that regulate body processes; neither is produced primarily to combat pathogens.