A Newborn Is Found to Have Persistent Jaundice That Does

A newborn is found to have persistent jaundice that does not resolve spontaneously even 4 weeks after birth.Repeated blood tests show an unconjugated hyperbilirubinemia, with bilirubin levels of 8 to 15 mg/dL on different occasions.Finally, treatment with phenobarbital succeeds in bringing the bilirubin level to less than 4 mg/dL.This disorder is most likely:

A) Dubin-Johnson syndrome.
B) Gilbert syndrome.
C) Crigler-Najjar syndrome type II.
D) Rotor syndrome.
E) Megaloblastic anemia.