The antigen lacking in Rh negative person is -: (A) C, (B) D, (C) d, (D) E
Answer is B. The commonly used terms Rh factor, Rh positive and Rh negative refer to the D antigen only. Besides its role in blood transfusion, the D antigen is used to determine the risk of hemolytic disease of the newborn (or erythroblastosis fetalis) for Rh disease management.