This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Drugs least effective against MRSA 
Select and explain. 
A. Teicoplanin, B. Meropenem, C. Quinupristin, D. Linezolid
B: Meropenem
Answer: B: Meropenem 
Explanation: Drugs effective against MRSA are SS Cotrimoxazole, SS Ceain cephalosporins, SS Vancomycin, SS Teicoplanin, SS Dalfopris n, SS Quinupris n SSLinezolid.