Immunoglobulin crossing placenta is_________________?
Correct answer: C. Ig G
- A. Ig M
- B. Ig A
- C. Ig G
- D. Ig D
Explanation
IgG is the only major immunoglobulin that crosses the placenta in significant amounts, providing passive protection to the fetus and newborn. IgM is too large to cross normally.
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