This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Antibody transferred from mother to foetus - \nSelect and explain. \nA. IgG, B. IgM, C. IgD, D. IgA', 'role': 'user'}, {'content': "Answer: A \nExplanation: IgG is the main serum immunoglobulin consisting of 80% of the total. equally distributed between intravascular and extravascular compaments. IgG is the only maternal immunoglobulin that is normally transpoed across the placenta and provide natural passive immunity in the newborns. Reference : Anathanarayan & paniker's 9th edition, pg no: 96,97 <\\p>", 'role': 'assistant'}]