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Question

The exaggerated response of the immune system to certain antigens is called

A
allergy
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B
inflammation
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C
infection
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D
auto-immunity
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Solution

The correct option is A allergy
Allergy is the exaggerated response of the immune system (IgE type antibodies released) to certain antigens such as pollen, dust, etc.
Auto-immunity is the the damage of self-cells by the body due to an abnormality. e.g : rheumatoid arthritis
Inflammation is the swelling and redness of an injured region of the body and is a response to tissue damage. It is always followed by repair.
Infection is a condition caused by a pathogen such as bacteria, fungi, etc. and is characterised by a fever. e.g : TB, UTI, etc

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