This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Protein Synthesis Inhibitors, Subject name: Pharmacology
Which of the following antimicrobial stops protein synthesis by inhibition of translocation? 
Select and explain. 
A. Aminoglycosides, B. Tetracyclines, C. Macrolides, D. Chloramphenicol
C: Macrolides
Answer: C: Macrolides 
Explanation: Tetracycline - Binds reversibly to the 30S subunit of the bacterial ribosome, blocking the binding of aminoacyl-tRNA to the acceptor site on the m-RNA ribosome complex. Chloramphenicol - It binds reversibly to the 50S subunit of the bacterial ribosome and inhibits peptide bond formation. Macrolides - Inhibit the translocation Aminoglycosides - protein synthesis is inhibited in three ways: 1. Cause misreading of mRNA-affect permeability. 2. interference with the initiation complex of peptide formation 3.Breakup of polysomes into nonfunctional monosomes.