Question

allergies are due to __________. a an excess number of antigens b not enough antibodies formed c antibodies being produced for substances that ordinarily would do no harm to the body d transplanted tissue

Explanation:

Allergies occur when the immune system overreacts to harmless substances (allergens) by producing antibodies (such as IgE) against them. This is an inappropriate immune response. Antigens in general (A) - having an excess number isn't the core of allergies as allergies are about the immune system's mis - identification. Not enough antibodies (B) is incorrect because in allergies, antibodies (though inappropriately) are produced. Transplanted tissue (D) is related to transplant rejection (due to immune response against foreign tissue in the transplant) not allergies.

Answer:

C. antibodies being produced for substances that ordinarily would do no harm to the body