Barry Marshall and his collaborators showed that
A) Helicobacter pylori bacteria are protective against peptic ulcers.
B) Helicobacter pylori bacteria cause chronic gastritis and stomach ulcers.
C) lab animals are easily infected by Helicobacter pylori.
D) lifestyle factors such as stress,diet,and smoking cause chronic gastritis and stomach ulcers.
Correct Answer:
Verified
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