Which Combination of Parents Might Have a Child with Erythroblastosis

Question

Which combination of parents might have a child with erythroblastosis fetalis?
A) Both parents are Rh positive.
B) Both parents are Rh negative.
C) The mother is Rh positive; the father is Rh negative.
D) The mother is Rh negative; the father is Rh positive.

Accepted Answer

Erythroblastosis fetalis occurs when a Rh-negative mother carries a Rh-positive fetus. This can happen only if the mother is Rh-negative and the father is Rh-positive. Therefore, the correct choice is D.