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': 'Which of the following is NOT a "Chemoattractant". \nSelect and explain. \nA. Leukotriene B 4, B. IL8, C. C5a, D. C3', 'role': 'user'}, {'content': 'Answer: D \nExplanation: C3', 'role': 'assistant'}]