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A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, on return to the plains, the symptoms disappeared. What is such a response called? How does the body produce it?

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Such a response is called allergic reaction or allergy. On exposure to allergens like dust, pollens, etc., chemicals like histamine and serotonin are released from the mast cells, resulting in an allergic response.

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