This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
True about immunoglobulins- 
Select and explain. 
A. IgE has maximum serum concentration, B. IgG has maximum serum concentration, C. IgA has minimum serum concentration, D. IgM has minimum serum concentration
B: IgG has maximum serum concentration
Answer: B: IgG has maximum serum concentration 
Explanation: None