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: Social & Preventive Medicine
[{'content': 'For studying the complete amino acid sequence of two polypeptide chains of Insulin, Nobel Prize was awarded to \nSelect and explain. \nA. Fredreich Sanger, B. Banting and Macleod, C. Paul Muller, D. Alexander Fleming', 'role': 'user'}, {'content': 'Answer: A \nExplanation: LIST OF FEW NOBEL LAUREATES IN PHYSIOLOGY OR MEDICINE\n\nSir Ronald Ross: Life cycle of Plasmodium\nI.P. Pavlov: Physiology of digestion\nRobert Koch: Discoveries in Tuberculosis\nPaul Ehrlich: Immunity\nF.G. Banting & J.J.R. McLeod: Insulin\nWillem Einthoven: ECG\nKarl Landsteiner: Human blood groups\nSir Alexander Fleming: Penicillin\nPaul H. Muller: DDT\nS.A. Waksman: Streptomycin (First antibiotic, against TB)\nHar Gobind Khorana: Interpretation of genetic code\nSir Godfrey N. Hounsfield: CT scan\nJ.E. Murray & E.D. Thomas: Organ and cell transplantation\nSir Peter Mansfield: MRI\nB.J. Marshall & J.R. Warren: H. pylori; its role in peptic ulcer disease\nH.Z. Hausen: HPV causing cervical cancer\nF.B. Sinnoussi & L. Montagnair: HIV\nRobert G. Edwards: In-vitro fertilization', 'role': 'assistant'}]