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 the following inflammatory mediators are derived from the cells except 
Select and explain. 
A. Kinins, B. Cytokines, C. Histamine, D. Leukotriene
A: Kinins
Answer: A: Kinins 
Explanation: . Kinins