This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
All of the following mediators of acute inflammation are derived from cells except - 
Select and explain. 
A. Kinins, B. Cytokine, C. Histamine, D. Leukotriene
A: Kinins
Answer: A: Kinins 
Explanation: Complement system, kinins, coagulation and fibrinolytic system are plasma protein derived. Basic Pathology, Robbins. Page no.: 45