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
[{'content': 'Which interleukin is needed for differentiation of eosinophils: September 2009 \nSelect and explain. \nA. IL1, B. IL2, C. IL4, D. IL5', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: IL5', 'role': 'assistant'}]