Which of the following couples would a doctor advise not to have more than one child?

  • A
    Male $Rh^+$ and Female $Rh^-$
  • B
    Male $Rh^-$ and Female $Rh^+$
  • C
    Male $Rh^+$ and Female $Rh^+$
  • D
    Male $Rh^-$ and Female $Rh^-$

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