This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology Pa 1 (Immune Response, Antigen-Antibody Reactions, Hypersensitivity, Structure of Immune System, Immunodeficiency Disorders), Subject name: Microbiology
[{'content': 'Immunoglobulin responsible for anamnestic response is - \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. IgE', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Anamnestic response is the secondary immune response. This response is through memory cells, which store information regarding the recognition of a pathogen based on previous interaction. IgG antibodies are produced later in the immune response, usually after a secondary exposure is characterized as follows: lower concentrations of immunogen are required to stimulate the response, the lag phase is shoer than the primary response, antibody is synthesized faster and lasts longer. The capacity for a secondary or anamnestic response lasts for many years. Long after the primary response (lgM) antibodies are no longer detectable, an immunogen can ellicit a prompt secondary response. For this reason it is sometimes referred to as the "anamnestic" or memory antibody response.', 'role': 'assistant'}]