This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oxygen dependent bacterial killing, Subject name: Pathology
Which of the following is the main stimulator of production of eosinophils? 
Select and explain. 
A. IL-1, B. IL-5, C. IL-4, D. IL-6
B: IL-5
Answer: B: IL-5 
Explanation: 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.