The following diagnostic tests are useful for corresponding purposes except: (A) Ziehl-Neelsen staining - Detection of mycobacteria, (B) Immunoflorescence - Detection of Influenza virus, (C) Specific IgM antibodies - Immunity against Rubella, (D) Specific IgM antibodies - Detection of acute infection
Answer is C. IgM antibody appears following an acute infection. It is not specific for a disease. Ref: Baveja textbook of microbiology; 4th edition