Exams › SSC CGL (Prelims) › GK

Which blood group is known as the universal donor?

1. O+
2. O−
3. AB+
4. A−

Correct answer: O−

Solution

The universal donor for red blood cell transfusion is O negative because its red blood cells do not have A, B, or Rh antigens. This makes it least likely to cause an immune reaction in recipients of other blood groups.

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