<prompt> Which one of following is functions of PGI2?Vasoconstriction and inhibits platelet aggregationVasodilator and inhibits platelet aggregationVasoconstriction and increases platelet aggregationVasodilator and increases platelet aggregation  <response>: The most impoant PG ones in inflammation are:-PGE2, PGD2, PGF2a, PGI2 prostacyclin, and TxA2 thromboxane A2, each of which is derived by the action of a specific enzyme on an intermediate in the pathway. Note:-A thromboxane-prostacyclin imbalance has been implicated as an early event in thrombus formation in coronary and cerebral blood vessels. 