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
All are true regarding Mechanism of action except: 
Select and explain. 
A. Chloramphenicol - Protein synthesis, B. Tetracycline - Cell wail synthesis, C. Metronidazole -- DNA, D. Penicillin - cell wall synthesis
B: Tetracycline - Cell wail synthesis
Answer: B: Tetracycline - Cell wail synthesis 
Explanation: Ref: Basic & Clinical Pharmacology Katzung 12th ed. p.8J8Explanation:Tetracycline inhibits bacterial protein synthesis by- binding to 30S ribosomal subunit. The remaining drugs are matched correctly with their mechanism of action.