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': 'This serum immunoglobulin constitutes 80% of immunoglobulins in our body is \nSelect and explain. \nA. IgM, B. IgA, C. IgG, D. IgD', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 80% of immunoglobulins in our body is IgG -major ig Half-life is 23 days Transpoed through placenta Ref: Text book of Microbiology Baveja 5th ed Pg 99', 'role': 'assistant'}]