An allergy is a hypersensitivity to substances that are essentially harmless. For as yet poorly understood reasons, the immune system malfunctions and marshals up an army of antibodies to fight these substances. For many allergies, this malfunction causes a large amount of histamine to flood into the bloodstream. It is overabundance of histamine that causes allergic symptoms such as headaches, rashes, and sneezing. the passage states all of the following about allergies except

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1. An allergy is a hypersensitivity to substances that are essentially harmless. For as yet poorly understood reasons, the immune system malfunctions and marshals up an army of antibodies to fight these substances. For many allergies, this malfunction causes a large amount of histamine to flood into the bloodstream. It is overabundance of histamine that causes allergic symptoms such as headaches, rashes, and sneezing. the passage states all of the following about allergies except