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': 'Mediator of acute inflammation not derived from cell is - \nSelect and explain. \nA. Histamine, B. Leukotrienes, C. Kinins, D. Cytokines', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Kinins', 'role': 'assistant'}]