The mother of a 5-year-old girl describes her daughter's symptoms to the nurse in the emergency ...

The mother of a 5-year-old girl describes her daughter's symptoms to the nurse in the emergency room. She states that her daughter has had a dry, hacking cough for the past 3 days that gets worse during the night.
 
  She further states that now she is coughing up phlegm. Which discharge instruction does the nurse plan to provide?
  A.
  Do not be surprised if she vomits her secretions.
  B.
  Give your child cough drops as often as needed.
  C.
  Return if she is not better after 3 days of antibiotics.
  D.
  You can use a warm-mist humidifier in her room.