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: Pathology
[{'content': 'Function of IL-4 is - \nSelect and explain. \nA. Inhibiting IL-1, B. Chemotaxis, C. Vasodilatation, D. Inhibiting macrophages', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans is \'a\' i.e. Inhibiting IL-1 [Ref Principles of Cancer Biotherapy p.1731"In monocytes, IL-4 inhibits IL-1, TNF-alpha and IL-6." - Principles of Cancer Biotherapy p.173.', 'role': 'assistant'}]