This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
Which of the following drugs is not used for H.pylori treatment? 
Select and explain. 
A. Oxytetracycline, B. Bismuth compounds, C. Amoxicillin, D. Omeprazole
A: Oxytetracycline
Answer: A: Oxytetracycline 
Explanation: (ref :KDT 6/e p637)