What are the five main classes of immunoglobulins found in humans?
A. IgB, IgD, IgE, IgG, IgM
B. IgA, IgD, IgE, IgG, IgM
C. IgA, IgB, IgC, IgD, IgE
D. IgD, IgE, IgG, IgM, IgS
E. IgA, IgC, IgE, IgG, IgI
Answer: B
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