The right answer is A+.
The determination of a blood group consists in showing, on the surface of the red blood cells, the presence or absence of the antigens A and B and the presence or absence of the standard Rh antigen (D). It is routinely performed in blood donors, in people who will benefit from a blood transfusion and in pregnant women.
* People with red blood cells with A antigen are blood group A.
* People with red blood cells with B antigen are blood group B.
* People with red blood cells with antigens A and B are AB blood group.
* People who have none of these antigens are blood group O.
* People with Rhesus antigen (D), also called Rh are Rh + blood group (positive). Those whose red blood cells do not carry the Rh antigen are Rh - (negative).
