Which of the following is the main stimulator of production of eosinophils?: (A) IL-1, (B) IL-5, (C) IL-4, (D) IL-6
Answer is B. IL-5 is required for the development and maturation of the eosinophil. TH2 cells produce IL-5, which stimulates the production of eosinophils in the marrow and activates eosinophils at sites of immune responses.