Moderate
A person of which the following blood groups is called a universal donor?
Correct answer: A. O
- A. O
- B. AB
- C. A-
- D. A+
Explanation
Group O red blood cells lack A and B antigens, so they are least likely to be attacked by a recipient's antibodies. In complete blood-group terminology, O negative is the universal red-cell donor; the option gives only the ABO group.
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