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
This serum immunoglobulin constitutes 80% of immunoglobulins in our body is 
Select and explain. 
A. IgM, B. IgA, C. IgG, D. IgD
C: IgG
Answer: C: IgG 
Explanation: 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