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
Vasodilation is caused by all, EXCEPT: 
Select and explain. 
A. Prostacyclin, B. Thromboxane A2, C. PGE1, D. PGD2
B: Thromboxane A2
Answer: B: Thromboxane A2 
Explanation: Principal Inflammatory Actions of Arachidonic Acid Metabolites (Eicosanoids) ACTION EICOSANOIDS Vasodilation PGI2 (prostacyclin), PGE1, PGE2, PGD2 Vasoconstriction Thromboxane A2, leukotrienes C4, D4, E4 Increased vascular permeability Leukotrienes C4, D4, E4Ref: Robbins 8th edition Chapter 2.