<prompt> Which of the following causes decrease in BPThromboxane A2VasopressinNOPGF2  <response>: NOSubstances which cause vasodilatation can cause fall in BP.Substances which cause vasoconstriction can cause a rise in BP.Among the given options only NO nitric acid is vasodilator causes fall in BP. Other three options cause vasoconstriction cause rise in BP. 