Which of the following statements concerning the Rh factor is CORRECT?
A. The Rh antigen is on white blood cells.
B. Eighty-five percent of humans are Rh positive.
C. Preexisting antibodies occur in 85% of the population.
D. Rh antibodies are more abundant than the ABO antibodies.
E. Eighty-five percent of the human population is Rh negative.
Answer: B
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