This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemical Mediators and Regulators of Inflammation, Subject name: Pathology
Function of IL-4 is? 
Select and explain. 
A. Inhibiting IL-1, B. Chemotaxis, C. Vasodilatation, D. Inhibiting macrophages
A: Inhibiting IL-1
Answer: A: Inhibiting IL-1 
Explanation: Ans is 'a' i.e. Inhibiting IL-1 "In monocytes, IL-4 inhibits IL-1, TNF-alpha and IL-6." - Principles of Cancer Biotherapy p. 173