This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
[{'content': 'Acute endocarditis with abscess is most commonly associated with? \nSelect and explain. \nA. Listeria, B. Staphylococcus, C. Streptococcus, D. Enterococcus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) StaphylococcusRef: Harrison's 18th ed ch:124, Braunwald's HeartDisease: A Textbook of Cardiovascular Medicine 18thed ch-63", 'role': 'assistant'}]