This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Which of the following do not play role in production, maintainance & activation of lymphocytes? - 
Select and explain. 
A. IL-1, B. IL-2, C. IL-4, D. IL-12
D: IL-12
Answer: D: IL-12 
Explanation: Ananthanarayanan and Paniker's textbook of microbiology 9th edition . IL1 helps in the proliferation and differentiation of T and B lymphocyte. IL2 Promote growth and differentiation of Tand B cells. IL4 promote proliferation B and cytotoxic T lymphocytes. IL12 activates NK cells.