This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which interleukin is needed for differentiation of eosinophils: September 2009 
Select and explain. 
A. IL1, B. IL2, C. IL4, D. IL5
D: IL5
Answer: D: IL5 
Explanation: Ans. D: IL5