This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
Which of the following is an impoant distinguishing characteristic of H. pylori as compared to Campylobacter species? 
Select and explain. 
A. Oxidase production, B. Catalase production, C. Urease production, D. Curved shape
C: Urease production
Answer: C: Urease production 
Explanation: Both Campylobacter and Helicobacter Belong to the family Campylobacteriaceae. Both are GNspiral-shaped or comma-shaped bacteria. Catalase and oxidase positive. Urease however, is produced only by Helicobacter.