The condition of erythroblastosis fetalis occurs only when

  • A
    the husband is $Rh^{+}$ and the wife is $Rh^{-}$
  • B
    the husband is $Rh^{-}$ and the wife is $Rh^{+}$
  • C
    the mother is $Rh^{+}$ and the father is $Rh^{-}$
  • D
    the mother is $Rh^{-}$ and the father is $Rh^{+}$

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