35. The laboratory finds IgA in a sample of cord blood from a newborn infant. This finding is important because it signifies what?

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35. The laboratory finds IgA in a sample of cord blood from a newborn infant. This finding is important because it signifies what? 
a. fetal reaction to an infection acquired at birth 
b. maternal exposure to an infection in the fetus 
c. maternal exposure to an infection in a sexual partner 
d. fetal reaction to exposure to an intrauterine infection

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