The potential for hemolytic disease of the newborn occurs when
A. fetal Rh- cells enter an Rh+ mother.
B. maternal Rh+ cells enter an Rh- fetus.
C. fetal Rh+ cells enter an Rh+ mother.
D. maternal Rh- cells enter an Rh+ fetus.
E. fetal Rh+ cells enter an Rh- mother.
Answer: E
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Fill in the blank(s) with the appropriate word(s).
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