Which one pair of the following parents is most likely to

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Which one pair of the following parents is most likely to get a child who suffer from hemolytic disease of new born?

1. Rh-negative mother and Rh-positive father
2. Rh-positive mother and Rh-negative father
3. Rh-negative mother and Rh-negative father
4. Rh-positive mother and Rh-positive father

Correct Option: A

Hemolytic disease of the newborn occurs when a Rh^- mother conceives a Rh⁺ child. Mother’s blood starts producing antibodies against the foetal red blood cells.