A universal donor is a person having blood group of __

A universal donor is a person having blood group of __ Correct Answer O+

For emergency transfusions, blood group type O negative blood is the variety of blood that has the lowest risk of causing serious reactions for most people who receive it. Because of this, it's sometimes called the universal blood donor type.

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A donor having blood group AB cannot donate his/her blood to the recipient who has blood group O because