This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Which of the following is not a pro-inflammatory cytokine? 
Select and explain. 
A. IL-1, B. TNF alpha, C. IL-4, D. IL-8
C: IL-4
Answer: C: IL-4 
Explanation: Proinflammatory cytokines include interleukin-1 (IL-1), tumour necrosis factor alpha (TNFa), IL-6 and IL-8Counterinflammatory response regulated by IL-4, -5, -9 and-13 and transforming growth factor beta )Ref: Bailey and love 27e pg: 3,4