How can pregnancy cause a woman to make an antibody to a red blood cell antigen?
a. Fetal cells carrying an antigen inherited from the mother and foreign to the father cross the placenta
b. Fetal cells carrying an antigen inherited from the father and foreign to the mother cross the placenta
c. Fetal cells carrying a homozygous dose of an antigen cross the placenta
d. Fetal cells carrying a heterozygous dose of an antigen cross the placenta
Answer: b
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