A client scheduled for disc surgery tells the nurse that she frequently uses the herbal supplement kava-kava (piper methysticum). The nurse should notify the doctor because kava-kava:

C Increases urinary output, so a urinary catheter will be needed post-operatively A Increases the effects of anesthesia and post-operative analgesia D Depresses the immune system, so infection is more of a problem B Eliminates the need for antimicrobial therapy following surgery