The antibody class whose serum levels are highest is:
A. IgE
B. IgM
C. IgD
D. IgG
Answer:D
The antibody class whose serum levels are highest is:
A. IgE B. IgM C. IgD D. IgG
Explanation: Immunoglobulin G (IgG), which makes up approximately 80% of all antibodies, has the highest serum levels.