This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'The antibody class specific for infectious mononucleosis is: March 2003 \nSelect and explain. \nA. IgA, B. IgD, C. IgM, D. IgG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. IgM', 'role': 'assistant'}]