The Clinic Nurse Is Returning Phone Calls

The clinic nurse is returning phone calls. Which call should the nurse return first?

A) The call from a 22-year-old reporting that she has menstrual cramps and vomiting every month
B) The call from a 17-year-old asking whether there is a problem with using one tampon for a whole day
C) The call from a 46-year-old mother of a teen wondering if her daughter should be on birth control
D) The call from a 34-year-old requesting information on douching after intercourse