This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
NK cell activity is enhanced by: 
Select and explain. 
A. IL1, B. TNF, C. IL 2, D. TGFb
C: IL 2
Answer: C: IL 2 
Explanation: Ans. (c) IL 2(Ref: Robbins 9th/pg 192; 8th/pg 188)Cytokines secreted by NK cells: QInterferon-g (IFN-g), which activates macrophagesIL-2 and IL-15 stimulate proliferation of NK cellsIL-12 activates killing and secretion of IFN-g