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B
Heparin
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C
Prothrombin
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D
None of the above
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Solution
The correct option is A Histamine Histamine is secreted by basophils during allergy. Histamine is an organic nitrogenous compound which is involved in local immune responses as well as regulating physiological function in the gut and acting as a neurotransmitter. Histamine is involved in the inflammatory response. As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues.