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Blood group O acts as universal donor.

1. Blood group O acts as universal donor.
2. Blood group O acts as universal recipient.
3. Blood group AB acts as universal donor.
4. Blood group AB acts as universal recipient.

Correct answer: Blood group O acts as universal donor.

Solution

Blood group O red blood cells lack A and B antigens, so they are least likely to trigger an immune reaction in recipients. That is why O is called the universal donor for red cell transfusions.

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