Multiple choice general knowledge science & technology

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 individuals lack A and B antigens on their red blood cells, making their blood compatible with all other blood types during transfusion. O negative (lacking Rh factor) is the true universal donor. AB has both antigens, A has only A antigen, B has only B antigen.

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