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': 'When an antigen is administered for the first time to an animal or a human being who has never been exposed to it, the first antibody to develop - \nSelect and explain. \nA. IgG type, B. IgM type, C. IgA type, D. IgE type', 'role': 'user'}, {'content': "Answer: B \nExplanation: IgM is a heavy molecule. IgM molecules are polymers of five four-peptide subunits. - IgM antibodies are relatively sho-liveddisappearing earlier than IgG. hence their demonstration in serum indicates recent infection. RefReference:athanarayan & paniker's 9th edition, pg no: 98 <\\p>", 'role': 'assistant'}]