Explanation:
The biological role of immediate hypersensitivity is to control helminth infections such as schistosomiasis, hookworm of Ascaris. However, it is likely to be a combination of effector TH2 cells, basophils and eosinophils, as well as IgE antibodies on mast cells that control these worms.
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D. Primo because the sentence says “the son of my uncle is my... cousin :)”
