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A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?

1. Blood group B
2. Blood group AB
3. Blood group O
4. Blood group A

Correct answer: Blood group O

Solution

Blood group O red cells have neither A nor B antigens, so they are least likely to trigger an immediate ABO incompatibility reaction in an unknown recipient. That is why O is used for emergency transfusions when the patient’s blood group is not yet known.

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