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Biology Medium FPSC PPSC NTS Uploaded: 14 Jul 2026

Which blood group is known as the universal donor?

  • A AB positive
  • B A negative
  • C B negative
  • D O negative
Correct Answer: Option D — O negative
Explanation:
O negative blood is the universal donor type because it lacks A B and Rh antigens on red blood cells making it compatible for transfusion to recipients of any blood type.
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