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
Secondary immune response is mediated by 
Select and explain. 
A. IgA, B. IgG, C. IgM, D. IgE
B: IgG
Answer: B: IgG 
Explanation: Secondary immune response is mediated by IgG, IgM - Primary Immune response, IgA - Secretory Immunoglobulin found in glandular secretions and serum, IgE - Type I HS Reactions Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 96-98