<prompt> A characteristic feature of acute inflammationVasoconstrictionVascular stasisMargination of leucocytesVasodilatation and increased vascular permeability  <response>: Acute inflammation has three major steps: -Among these three major steps The hallmark of acute inflammation is increased vascular permeability leading toescape of protein-rich fluid exudates into the extravascular tissue.Mechanism of increased vascular permeabilityi. Formation of endothelial gaps in venulesii. Direct endothelial injury resulting in endothelial cell necrosis and detachment.iii. Delayed prolonged leakageiv. Leucocyte mediated endothelial injury. 