Final answer:
The blood type that reacts with anti-A and anti-Rh antiserums only is A positive (A+), indicating the presence of A antigens and the Rh D antigen on the red blood cells.
Step-by-step explanation:
If an unknown blood type reacts with anti-A and anti-Rh antiserums ONLY, the blood type is A positive (A+). This reaction pattern indicates the presence of A antigens on the surface of red blood cells and the presence of the Rh factor D antigen, making the individual Rh positive. No agglutination with anti-B serum indicates that B antigens are absent on the red blood cells. Therefore, the individual does not have type B or AB blood. The importance of Rh factor in transfusions and pregnancies is well-documented; Rh-positive individuals have the Rh antigen and can receive Rh-positive or Rh-negative blood, but Rh-negative individuals should only receive Rh-negative blood to prevent the production of anti-Rh antibodies that lead to agglutination and hemolysis.