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 is the major cytokine produced by TH2 helper Tcell 
Select and explain. 
A. IFN - γ, B. IL - 17, C. IL - 4, D. IL - 12
C: IL - 4
Answer: C: IL - 4 
Explanation: IL - 4, 5, 6 are the major cytokines produced by TH2 helper TCell.
IFN - γ, IL - 12 is produced by TH 1 Cell.