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': 'Willem Einthoven got Nobel Prize for \nSelect and explain. \nA. Insulin, B. ECG, C. Plasmodium life cycle, D. Penicillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: List of Nobel Laureates\n\nWillem Einthoven : ECG.\nSir Alexander Fleming : Penicillin.\nPaul. H. Muller : DDT.\nSir Godfrey N.Hounsfield : Human blood groups.\nKarl Landsteiner : Human blood groups.\nPaul Ehrlich : Immunity.\nSir Peter Mansfield : MRI.', 'role': 'assistant'}]