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': 'Berson and yellow 1st described the following test \nSelect and explain. \nA. RIA, B. ELISA, C. Immuno chromatography, D. Chemiluminescence assay', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Berson and Yalow discovered RIA in 1959 by which we can quantify antigens or hormones upto picograms-v sensitive than ELISA RIA /ELISA-indirect immunofluorescence tests Ref: Textbook of Microbiology Baveja 5th ed Pg 115', 'role': 'assistant'}]