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: Surgery
Hpylori 
Select and explain. 
A. Gram -ve non flagellate spiral organism, B. obligate parasite on gastric mucosa, C. Doesnot infect duodenal mucosa, D. Antibiotics not effective
B: obligate parasite on gastric mucosa
Answer: B: obligate parasite on gastric mucosa 
Explanation: None