This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Eosinophil are activated by \nSelect and explain. \nA. IL 1, B. IL5, C. IL4, D. IL6', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ref Robbins 8/e p200; IL 5 is required for the development and maturation of eosinophil Through binding to the interleukin-5 receptor, interleukin 5 stimulates B cell growth and increases immunoglobulin secretion - primarily IgA. It is also a key mediator in eosinophil activation.', 'role': 'assistant'}]