A client is to have a cesarean delivery because of continuous vaginal bleeding and an abnormal fetal heart rate tracing. Which of the following would be the best preoperative medication for this client ？（）

A．Meperidine (Demerol).

B．Oxytocin (Pitocin).

C．Promethazine (Phenergan).

D．Glycopyrrolate (Robinul).

鸡传染性鼻炎用药物治疗（）。

A、无效

B、有效、但常复发

C、能根治