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
Interleukin secreted by Th1 cells include? 
Select and explain. 
A. IL-2, B. IL-4, C. IL-10, D. IL-13
A: IL-2
Answer: A: IL-2 
Explanation: Ans. (a) IL-2(Ref: Robbins 9th/198 )Cells of the TH1 subset secrete IL-2 for self activation & cytokine IFN-g, which is a potent macrophage activator.