The Antiemetic Drug Ondansetron (Zofran) Is Being Administered to a Child

The antiemetic drug ondansetron (Zofran) is being administered to a child receiving chemotherapy. It should be administered:

A) Only if the child experiences nausea.
B) Before chemotherapy administration, as a prophylactic measure.
C) After the chemotherapy has been administered.
D) Never; this antiemetic is not effective for controlling nausea and vomiting associated with chemotherapy.