Which microorganism is involved in the etiology of peptic ulcer:
  1. Clostridium difficile
  2. Heliobacter pylori
  3. Heliobacter baculiformis
  4. Vibrio vulnificus
Explanation
Answer: B - The microorganism which causes peptic ulcer is Heliobacter pylori, commonly known as H. pylori. H. pylori causes peptic ulcer by eroding the mucosal lining of the stomach.
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