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': 'Pentavalent immunoglobin is \nSelect and explain. \nA. IgA, B. IgG, C. IgM, D. IgE', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., IgM", 'role': 'assistant'}]