Development of Serum Antibodies

Question

Which of the following is NOT a way in which "immune" ABO antibodies may be formed?

Please select the single best answer

Fetal/maternal blood from a pregnancy with an ABO incompatible fetus.
Transfusion of a unit of a patient's own red cells (autologous unit) which have been previously collected and stored.
Transfusion with ABO incompatible red cells.

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