Function of IL-4 is -
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.
Inhibiting IL-1
Chemotaxis
Vasodilatation
Inhibiting macrophages