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': 'The following methods of diagnosis utilize labelled antibodies except - \nSelect and explain. \nA. ELISA (Enzyme Linked Immunosorbent Assay, B. Hemagglutination inhibition test, C. Radioimmunoassay, D. Immunofluorescence', 'role': 'user'}, {'content': "Answer: B \nExplanation: Hemagglutination inhibition offers a convenient method for the detection and quantitation of the antibody to the virus. Labeled antibodies are not used. RIA uses labeled antibody, ELISA uses enzyme-linked antibody and immunofluorescence use fluorescent lalabeledntibody. Reference : Anathanarayan & paniker's 9th edition, pg no:113, 116,501 <\\p>", 'role': 'assistant'}]