A person with unknown blood group under $ABO$ system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

  • A

    Type $AB$

  • B

    Type $O$

  • C

    Type $A$

  • D

    Type $B$

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