If the following features of the acute inflammatory reaction were placed in chronological order which would come fourth?

The answer is B. In the acute inflammatory response the injury results in an initial contraction of arterioles (A) followed rapidly by arteriolar dilatation (C) in the process of active hyperaemia; as a result of the hyperaemia the inflammatory exudate is formed (E) and is responsible for swelling and pain; the microcirculation remains engorged, but blood flow slows down (B) with associated emigration of leucocytes (D).