This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following represent the mechanism of action of tetracycline? 
Select and explain. 
A. Inhibits peptidyl transferase, B. Causes misreading of mRNA, C. Causes termination of peptide chain elongation, D. Binds to A site and inhibits attachment of tRNA
D: Binds to A site and inhibits attachment of tRNA
Answer: D: Binds to A site and inhibits attachment of tRNA 
Explanation: Tetracyclines are bacteriostatic antibiotics. It inhibits protein synthesis by binding to 30S ribosomal subunit, and prevents the attachment of aminoacyl tRNA to the mRNA - ribosome complex. As a result peptide chain fails to grow. Ref: Essentials of Medical Pharmacology, 5th Edition, Page 668-73