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 interleukin is secreted by T helper 2 cells? 
Select and explain. 
A. IL 11, B. IL 7, C. IL 1, D. IL 13
D: IL 13
Answer: D: IL 13 
Explanation: Ans. is 'd' i.e., IL 13