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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