An Allergy is defined as an increased responsive state resul

An Allergy is defined as:

an increased responsive state resulting from a second exposure to a toxicant

a decreased responsive state acquired through a previous exposure to a toxicant

a decreased responsive state resulting from a second exposure to a toxicant

an increased responsive state acquired through a previous exposure to a toxicant

Solution

Ans D

Allergy is a hyper sensitivity to particular antigen or foreign object such as dust, pollen etc that elicits an exaggerated response in the body in form of hay fever, rashes, itching, sneezing etc.

When the body is allergic towards an allergen, it elicits the response again on its contact, as the immune system remembers the previous response