People with what blood type can give blood to anyone and are thus called universal donors?
Correct answer: A. O-
- A. O-
- B. O
- C. AB+
- D. AB-
Explanation
O-negative red blood cells lack A, B and Rh-D antigens, reducing the risk of incompatibility when urgently transfused. Universal-donor status applies mainly to red-cell transfusions, not every type of blood product.
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