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
The mechanism of action of tetracyclines involves : 
Select and explain. 
A. Binding of a component of the 50S ribosomal subunits, B. Inhibition of translocase activity, C. Blockade of binding of aminoacyl–tRNA to bacterial ribosomes, D. Selective inhibition of ribosomal peptidyl transferase
C: Blockade of binding of aminoacyl–tRNA to bacterial ribosomes
Answer: C: Blockade of binding of aminoacyl–tRNA to bacterial ribosomes 
Explanation: None