The newborn transition nurse is precepting a nursing student in labor and delivery. The nurse quizzes the student about the medications given to the newborn after birth. The nurse knows that the student understands the purpose of the erythromycin ointment when he provides which of the following explanations?

a. Decreases the risk of sepsis in the infant born to a client with undiagnosed chylamydia.
b. Inhibits the growth of group beta streptococcus (GBS) in the eyes of an infant born to a GBS+ client .
c. Treatment for erythema toxicum in the newborn who is not bathed until 24 hours after birth.
d. Prevents ophthalmia neonatorum in the infant born to a client with an untreated gonococcal infection.