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
Drug not used in H. pylori? 
Select and explain. 
A. Metronidazole, B. Omeprazole, C. Mosapride, D. Amoxicillin
C: Mosapride
Answer: C: Mosapride 
Explanation: None