The following immunoglobulin is not known to fix complement_________________?
Correct answer: A. IgE
- A. IgE
- B. IgM
- C. IgA
- D. IgG
Explanation
IgE does not normally activate the complement system, unlike IgM and most IgG, which are important classical-pathway antibodies. IgA is also a weak complement activator, especially in secretions, but IgE is the standard answer.
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