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
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-3, D. IL-12
D: IL-12
Answer: D: IL-12 
Explanation: Ans. is 'd' i.e., IL-12