This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
MRSA is resistant to: 
Select and explain. 
A. Vancomycin, B. b lactams, C. Linezolid, D. Meropenems
B: b lactams
Answer: B: b lactams 
Explanation: Ref: Sharma & Sharma 3nl ed. P 733* No b Lactams are effective against MRSA, EXCEPT 5th generation cephalosporins like Ceftaroline and Ceftibiprole.* DOC for MRSA: Vancomycin* DOC for VRSA: Daptomycin* Drugs used in VRSA: Quinpristin, Daptomycin, Linezolid