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': 'Predominant class of immunoglobulin during primary immune response is - \nSelect and explain. \nA. IgA, B. IgE, C. IgM, D. IgG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: IgM antibodies appear early in the course of an infection and usually reappear, to a lesser extent, after fuher exposure. Ref: Ananthanarayan & Parkers textbook of microbiology 9th edition pg:98', 'role': 'assistant'}]