Which of the following classes of antibodies crosses the placenta to provide passive immunity for the fetus?
A) IgM
B) IgA
C) IgE
D) IgG
D
Explanation: A) IgM is the first antibody produced in response to infections.
B) IgA protects epithelial surfaces.
C) IgE responds to allergic reactions and parasitic infections.
D) Correct
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