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 drugs are used for eradication of Helcobacter pylori except - 
Select and explain. 
A. Bismuth subcitrate, B. Sucralfate, C. Metronidazole, D. moxycillin
B: Sucralfate
Answer: B: Sucralfate 
Explanation: None