Which Statement Best Describes the Link Between Observational Studies and H

Which statement best describes the link between observational studies and H pylori?

A) Observational studies demonstrated a direct association between H pylori infection and peptic ulcer.
B) Observational studies established an inverse association between H pylori infection and inflammation in the stomach.
C) Observational studies confirmed that antibiotic therapy was effective for the treatment of peptic ulcer.
D) Observational studies identified a direct association between H pylori infection and gall bladder disease.

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