This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Principal Actions of prostacyclin in Inflammation is 
Select and explain. 
A. Vasodilation, B. Vasoconstriction, C. Increased vascular permeability, D. Chemotaxis, leukocyte adhesion
A: Vasodilation
Answer: A: Vasodilation 
Explanation: Principal Actions of Arachidonic Acid Metabolites in InflammationActionEicosanoidVasodilationProstaglandins PGI2 (prostacyclin), PGE1, PGE2, PGD2VasoconstrictionThromboxane A2, leukotrienes C4, D4, E4Increased vascular permeabilityLeukotrienes C4, D4, E4Chemotaxis, leukocyte adhesionLeukotrienes B4, HETERef: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Chapter 3; Inflammation and Repair; Page no: 84; Table 3-5