A 23-Year-Old Man Comes to the Physician with Dysuria and Increased

A 23-year-old man comes to the physician with dysuria and increased urinary frequency.  He is an active duty member of the US military and recently returned from sub-Saharan Africa, where he had been stationed for the last year.  The patient's symptoms have persisted for several months and have failed to resolve following antibiotic treatment.  His blood eosinophil count is elevated.  Urine microscopy shows schistosome eggs.  He is started on praziquantel and experiences improvement in his symptoms.  The elevated eosinophils in this patient contribute to the host defense against schistosomiasis through which of the following mechanisms?

A) Antibody-dependent cell-mediated cytotoxicity
B) B lymphocyte chemotaxis
C) Complement activation
D) Immediate hypersensitivity
E) MHC class I antigen processing

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