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
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 : 
Select and explain. 
A. Clarithromycin, B. Linezolid, C. Minocycline, D. Ticarcillin
B: Linezolid
Answer: B: Linezolid 
Explanation: None