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ASVAB · Biology and Life Science

Which blood type is the universal donor for red blood cells?

Correct answer

O negative

  1. A A positive
  2. B B negative
  3. C AB positive
  4. D O negative

Why this is the answer

O negative is the universal donor for red blood cells — it lacks A, B, and Rh antigens, making it compatible with all blood types.
Source: ASVAB GS, Biology, Blood Types

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