A 34-year-old female has recently been diagnosed with an autoimmune disease. She has also recently discovered that she is pregnant. Which of the following is the only immunoglobulin that will provide protection to the fetus in the womb

A 34-year-old female has recently been diagnosed with an autoimmune disease. She has also recently discovered that she is pregnant. Which of the following is the only immunoglobulin that will provide protection to the fetus in the womb?

A. IgA
B. IgD
C. IgE
D. IgG

Answer: D. IgG

IgG is the only immunoglobulin that can cross the placental barrier.

Option A: IgA antibodies protect body surfaces that are exposed to outside foreign substances.
Option B: IgD antibodies are found in small amounts in the tissues that line the belly or chest.
Option C: IgE antibodies cause the body to react against foreign substances such as pollen, spores, animal dander.