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
Mechanism of action of vancomycin is 
Select and explain. 
A. Inhibit protein synthesis, B. Inhibit cell wall synthesis, C. Inhibiting bacterial DNA replication, D. Inhibit DNA dependent RNA synthesis
B: Inhibit cell wall synthesis
Answer: B: Inhibit cell wall synthesis 
Explanation: (Inhibit - Cell wall synthesis) (732-KDT6th)VANCOMYCIN - bactericidal and acts by interfering with cell wall synthesis, inhibits the release of peptido glycah units from their site of assembly on cell membrane phospholipids. Thus these residues are not available for cross linking to form the cell wall* Clindemycin, Spectinomycin - inhibits protein synthesis* Nalidixic acid - acts by inhibiting bacterial DNA replication* Rifampicin - inhibits DNA dependent RNA synthesis