A substance produced by the host in response to an infection or foreign structure is

Antigen

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Toxin

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Hormone

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Antibody

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Solution

The correct option is D Antibody
An antibody is a type of proteinaceous substance produced by the body's immune system when it detects foreign particles called antigens. Examples of antigens include microorganisms (bacteria, fungi, parasites and viruses) and chemicals. Each type of antibody is unique and defends the body against one specific type of antigen.

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