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
All of the following binds to 50s ribosome unit except: 
Select and explain. 
A. Macrolide, B. Lincosamide, C. Chloramphenicol, D. Tetracycline
D: Tetracycline
Answer: D: Tetracycline 
Explanation: Aminoglycosidess and Tetracycline binds to 30s subunit of ribsome and inhibit protein synthesis.