This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro-Intestinal Tract, Subject name: Pharmacology
Anti-helicobacter pylori drugs are all of the following except:- 
Select and explain. 
A. Clarithromycin, B. Amoxicillin, C. Metronidazole, D. Ofloxacin
D: Ofloxacin
Answer: D: Ofloxacin 
Explanation: Antimicrobials effective against H. pylori are :- Metronidazole/tinidazole Amoxicillin Clarithromycin Tetracycline Colloidal bismuth subcitrate