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B
IgA
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C
IgM
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D
IgN
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Solution
The correct option is A IgG Immunoglobulin G (IgG) is a type of antibody., representing approximately 75% of serum antibodies in humans, IgG is the most common type of antibody found in blood circulation. The primary immunoglobulin of the newborn is the maternal IgG as this is the only immunoglobulin to cross the placental barrier. Hence, IgG is the immunoglobulin which is found in the serum of newborn babies.