What is the cause of hemolytic disease of the newborn?
A. The mother has eosinophilia during pregnancy.
B. An O blood type mother produces anti-A antibodies which cross the placenta and react with the baby's A antigens.
C. Antibodies of an A or B blood type mother cross the placenta and react with baby's O antigens.
D. The mother produces anti-Rh antibodies which cross the placenta and react with baby's Rh antigens.
E. The mother's mast cells degranulate in the placenta, damaging it.
Answer: D
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