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': 'Vascular dilation in the inflammatory response is mediated by all the following EXCEPT ? \nSelect and explain. \nA. Prostaglandins, B. C3a, C. Leukotrienes, D. C5a', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Leukotrienes", 'role': 'assistant'}]