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
Drug not used in treatment of H pylori is: 
Select and explain. 
A. Cisapride, B. Clarithromycin, C. Metronadizole, D. Omperazole
A: Cisapride
Answer: A: Cisapride 
Explanation: Cisapride