A person’s blood group is determined by antigens present on the red blood cells. Most people have antibodies in their blood plasma even if they have never received a blood transfusion. It is these antibodies in the plasma of the person who receives the blood which makes some blood transfusions unsafe.
The table shows the antigens and antibodies in the blood of people with different blood groups.
Which are the blood groups of people who can safely receive blood from a person who has blood group A?
A and AB
2 )
A and O
3 )
B and O
4 )
AB only
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