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
Vascular dilation in the inflammatory response is mediated by all the following EXCEPT ? 
Select and explain. 
A. Prostaglandins, B. C3a, C. Leukotrienes, D. C5a
C: Leukotrienes
Answer: C: Leukotrienes 
Explanation: Ans. is 'c' i.e., Leukotrienes