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 following diagnostic tests are useful for corresponding purposes except - \nSelect and explain. \nA. Ziehl - Neelsen staining - Detection of mycobacteria, B. Immunofluorescence - Detection of Influenza virus, C. Specific IgM antibodies - Immunity against Rubella, D. Specific IgM antibodies - Detection of acute infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: For any infection (including rubella) IgM antibody alone, without IgG means current (acute) infection.\n\n\nZiehl Neelsen staining is used for mycobacteria.\n\n\nRapid diagnosis of influenza is made by demonstration of viral antigen in specimens by Immunofluorescence.', 'role': 'assistant'}]