The nurse is providing care for a client who underwent mitral valve replacement. The best example of a measurable client outcome goal is to （）.

A．change his own dressing.

B．walk in the hallway.

C．walk from his room to the end of the hall and back before discharge.

D．eat a special diet.

毛茛科黄连属的植物黄连，干燥（）药用，为《药典》记载的中药材黄连。