$A$ person meets with an accident and a great loss of blood has occurred. There is no time to analyze his blood group. It is safe to transfuse blood of group:

  • A
    $AB, Rh^+$
  • B
    $AB, Rh^-$
  • C
    $O, Rh^-$
  • D
    $O, Rh^+$

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