This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
[{'content': 'Percussion was discovered by? \nSelect and explain. \nA. Leanacc, B. Leopald Aunbruger, C. Jenner, D. C. Bernard', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (Leopald Aunbruger)NAME ~DISCOVERYLaennecStethoscopeLeopald AunbrugerPercussionJennerSmall pox vaccineChristian BernardCardiac transplant', 'role': 'assistant'}]