What is an allergic reaction? the body's abnormal immune response to a foreign substance a mechanical injury caused by a foreign object a normal body function all of the above

The answer would be
"The body's abnormal immune response to a foreign substance"
because when a fairly new substance is rejected by the immune system the body goes into full defense mode, therefore, resulting in an Allergic Reaction. 

Role models are really important too, because they influence you.