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
[{'content': 'IL-2 is produced by \nSelect and explain. \nA. T cells, B. B cells, C. Monocytes, D. Neutrophils', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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)", 'role': 'assistant'}]