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
[{'content': 'What is not caused by platelet activating factor? \nSelect and explain. \nA. Vasoconstriction, B. Bronchodilation, C. Causes platelet aggregation, D. Transmits signals between cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]