$A$ doctor suggested a couple not to have more than one child because:

  • A
    Male is $Rh^{+}$ and female is $Rh^{-}$
  • B
    Male is $Rh^{-}$ and female is $Rh^{+}$
  • C
    Male is $Rh^{-}$ and female is $Rh^{-}$
  • D
    Male is $Rh^{+}$ and female is $Rh^{+}$

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