In which of the following scenarios would hemolytic disease of the newborn be a possibility?
A. Both mom and dad are Rh-negative.
B. Mom is Rh-negative and dad is Rh-positive.
C. Mom is blood type O and dad is blood type B.
D. Both mom and dad are Rh-positive.
E. Mom is Rh-positive and dad is Rh-negative.
Answer: B
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