Vasoconstricting mediator is?: (A) Prostacyclin, (B) Thromboxane-A2, (C) PG D2, (D) Lipoxins
Answer is B. Ans. is 'b' i.e., Thromboxane-A2 Thromboxane-A2 causes vasoconstriction. Other three mediators (given in question) cause vasodilatation.