A pressure screen is a piece of equipment used for fibre fractionation to produce pulp of a high, uniform quality. A typical pressure screen consists of a cylindrical casing, containing a screen basket and a rotor. Based on the context, what is the given information, A, B, C, or D? (    )
A、a pressure screen
B、fibre fractionation
C、a typical pressure screen
D、a cylindrical casing