The antibody which can cross placental barrier is

Solution (By Examveda Team)

Antibodies are like tiny soldiers in your body that fight off infections.
Different types of antibodies have different jobs and abilities.

* IgG (Immunoglobulin G): This is the only type of antibody that can cross the placenta. The placenta is a temporary organ that connects a developing baby to the mother's uterus.
Because IgG can cross the placenta, it provides passive immunity to the fetus (baby) before birth, protecting the baby from infections.

* IgA (Immunoglobulin A): Found mainly in body secretions like tears, saliva, and breast milk. It helps protect surfaces like your airways and digestive system from infections. IgA does *not* cross the placenta.

* IgE (Immunoglobulin E): Involved in allergic reactions and fighting off parasitic infections. IgE does *not* cross the placenta.

* IgM (Immunoglobulin M): The first antibody produced during an infection. It's a big molecule and stays mostly in the bloodstream. IgM does *not* cross the placenta.

So, IgG is special because it can travel from the mother to the baby across the placenta, providing crucial protection during pregnancy.