This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
IL-2 is produced by 
Select and explain. 
A. T cells, B. B cells, C. Monocytes, D. Neutrophils
A: T cells
Answer: A: T cells 
Explanation: IL-2 is produced by CD4 T helper cellsIts actions are:Promotes growth and differentiation of T and B cellsPromotes cytotoxicity of T cells and NK cellsPromotes secretion of other lymphokines IL-3 is produced by T cells for hematopoiesis(ref: Harrison's 18/e p2659, table 314-7)