单选题 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).

【正确答案】 D

【答案解析】Glycopyrrolate is a parasympatholytic that will decrease the risk of aspiration. Meperidine and promethazine can cause central nervous system and respiratory depression in neonates. Oxytocin precipitates labor.