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
All of the following are pyrogenic cytokines, Except- 
Select and explain. 
A. Interleuken 18 (IL-18), B. Interleuken 6 (IL-6), C. Tumor Necrosis Factor (TNF), D. Interferon a (IFN-a)
A: Interleuken 18 (IL-18)
Answer: A: Interleuken 18 (IL-18) 
Explanation: Ans. is 'a' i.e., Interleukin 18 (IL-18) Interleukin 18 is not a pyrogenic cytokine.