A person with an unknown blood group under th | vedclass

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(B) The blood type $O$ does not possess any antigens ($A$ or $B$) on the surface of its red blood cells,but it contains both anti-$A$ and anti-$B$ ant

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Type $O$

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(B) The blood type $O$ does not possess any antigens ($A$ or $B$) on the surface of its red blood cells,but it contains both anti-$A$ and anti-$B$ antibodies in the plasma.Because individuals with blood type $O$ lack both $A$ and $B$ antigens,their blood will not trigger an immune reaction (agglutination) when transfused into a recipient of any blood group.Therefore,a person with blood type $O$ is considered a universal donor,making it the safest choice for an emergency transfusion when the recipient's blood type is unknown.

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