A Patient with a Warm Reacting Autoantibody Needs 2 Units

A patient with a warm reacting autoantibody needs 2 units of compatible, packed cells. Medical history reveals a blood transfusion 2 months ago. A homologous absorption is performed using the following red blood cell phenotype: R²R², ss, Fy(a-b+) , Jk(a+b-) , kk. What alloantibody would remain in the serum after absorption?

A) anti-Jk^a
B) anti-E
C) anti-S
D) anti-Fy^b