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': 'Secondary immune response is mediated by \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. IgE', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]