If when the immune system recognizes a foreign substance, antibodies are produced, then what happens when the immune system recognizes a foreign substance?

Answer choices:
- an area swollen with pus
 - The immune system fails
 - irradiation
 - Bacteria dies
 - Antibodies are formed
 - major threat to health
 - Something that causes allergies
 - Viruses reproduce

 

     Antibodies are formed     