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
[{'content': 'All the following inflammatory mediators are derived from the cells except \nSelect and explain. \nA. Kinins, B. Cytokines, C. Histamine, D. Leukotriene', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Kinins', 'role': 'assistant'}]