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(A) The blood group $O$ negative $(O^-)$ is known as the universal donor. This is because red blood cells of $O^-$ blood type lack both $A$ and $B$ an

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$O$ negative

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(A) The blood group $O$ negative $(O^-)$ is known as the universal donor. This is because red blood cells of $O^-$ blood type lack both $A$ and $B$ antigens on their surface and also lack the $Rh$ factor. Therefore,they do not trigger an immune response (agglutination) when transfused into a recipient of any other blood group. In emergency situations where the patient's blood group is unknown,$O$ negative blood is the safest choice to prevent transfusion reactions.

If a person is injured and requires a blood transfusion,but the blood group of the patient is not checked,which of the following blood groups can be safely administered?

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