Biological marriage of one of the following should be avoided:

  • A
    $Rh^+$ male and $Rh^-$ female
  • B
    $Rh^+$ male and $Rh^+$ female
  • C
    $Rh^-$ male and $Rh^+$ female
  • D
    $Rh^-$ male and $Rh^-$ female

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