Multiple choice

Which blood group is known as the a universal donor?

  1. A

  2. B

  3. AB

  4. O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood type O, particularly O-negative, is called the universal donor because individuals with this blood type can donate red blood cells to people with any other blood type (A, B, AB, or O). This is possible because O-type blood lacks A and B antigens on red blood cells that would trigger an immune response. Blood types A, B, and AB each have specific antigens that make them incompatible with universal donation. The 'a' in the question appears to be a typo.

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