Multiple choice general knowledge

A person of which of the following blood groups is called a universal donor?

  1. O

  2. AB

  3. A

  4. B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood group O (especially O negative) is called the universal donor because O red blood cells lack A and B antigens on their surface. This means they can be transfused to almost any patient without triggering an immune reaction. AB is the universal recipient (can receive from all types). A and B can only donate to compatible types.

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