An Ambulatory Clinic Patient Telephones to Report Diarrhea and to Ask

An ambulatory clinic patient telephones to report diarrhea and to ask for advice on medication to manage it. The best response by the nurse is, "Do not use antidiarrheal medication for longer than:

A) 24 hours without calling back for an appointment."
B) 48 hours without calling back for an appointment."
C) 72 hours without calling back for an appointment."
D) 96 hours without calling back for an appointment."