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

Antibody

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Antigen

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Phytotoxin

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Hormone

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Solution

The correct option is C Antibody
An antibody (Ab), also known as an immunoglobulin is a large, Y-shaped protein produced mainly by plasma cells in response to infection to neutralize pathogens such as pathogenic bacteria and viruses. Antibodies are secreted by B cells of the adaptive immune system, mostly by differentiated B cells called plasma cells.
So, the correct answer is 'Antibody'.

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