Question

A 6-year-old child ate a peanut butter sandwich
at snack time in school. Five minutes later, her
throat became swollen and she collapsed. This
allergic reaction occurred because her body
(1) recognized an antigen in peanut butter and
produced antibiotics against it
(2) digested the white blood cells that can
recognize an antigen in peanut butter
(3) did not recognize an antigen in peanut
butter and could not produce antibodies
against it
(4) recognized an antigen in peanut butter and
produced an immune response

Answer 1

the answer is 3. did not recognize an antigen in peanut butter and could not produce antibiotics against it.

Answer 2

(4) recognized an antigen in peanut butter and produced an immune response.
Allergies occur when the body recognizes an antigen called allergen and reacts abnormally to it by producing immune responses which are usually inflammatory. This response is considered abnormal because the allergens are in other respects harmless to the body.