Which of the following is not true of the Rh factor?
A. It was named for the Rhesus monkey, in which it was first discovered.
B. It is an antigen found on some people's red blood cell membranes.
C. The most reactive of the Rh antigen group is antigen B.
D. A high percentage of Americans have the Rh factor.
E. All of these are true of the Rh factor.
Answer: C
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