$A$ person with an unknown blood group ($ABO$ system) has lost a large amount of blood in an accident and needs an immediate blood transfusion. $A$ friend of the person has a valid certificate of their own blood group and is ready to donate blood without delay. What could be the blood group of the donor friend?

  • A
    $AB$ type
  • B
    $O$ type
  • C
    $A$ type
  • D
    $B$ type

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