This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemical Mediators and Regulators of Inflammation, Subject name: Pathology
What is not caused by platelet activating factor? 
Select and explain. 
A. Vasoconstriction, B. Bronchodilation, C. Causes platelet aggregation, D. Transmits signals between cells
B: Bronchodilation
Answer: B: Bronchodilation 
Explanation: Ans. (b) Bronchodilation(Ref: R 9th/pg 89; 8th/pg 59)PAFProduced by: platelets, basophils, mast cells, neutrophils, macrophages, and endothelial cellsFunctions: platelet aggregation, vasoconstriction and bronchoconstriction. QAt low concentrations it induces vasodilation and increased venular permeabilityTransmits signals between cells