Multiple choice

Which blood group is known as the universal donor?

  1. A

  2. B

  3. AB

  4. O

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood group O is known as the universal donor because individuals with type O blood can donate red blood cells to recipients of any blood type (A, B, AB, or O). This is because type O red blood cells lack both A and B antigens on their surface, preventing immune reactions. Type AB is the universal recipient, not donor. Types A and B can only donate to specific matching types.

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