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: Pharmacology
[{'content': 'In a patient with culture-positive enterococcal endocarditis who has failed to respond to vancomycin because of resistance, the treatment most likely to be effective is : \nSelect and explain. \nA. Clarithromycin, B. Linezolid, C. Minocycline, D. Ticarcillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]