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: Medicine
All of the following are used for treatment of H.Pylori, except: 
Select and explain. 
A. Gentamycin, B. Clarithromycin, C. Metronidazole, D. Amoxicillin
A: Gentamycin
Answer: A: Gentamycin 
Explanation: Answer is A (Gentamycin): Gentamycin is not used in any of the successful multi-drug regimens against H. Pylori Infection.