Card 10 / 30: A 62 year old man has abdominal pain, hematemesis, and melena. He is not taking NSAIDs (nonsteroidal anti-inflammatory drugs) or aspirin. An upper endoscopy reveals a large posterior wall duodenal ulcer. A biopsy is obtained from the gastric antrum and a rapid urease test is positive. Which of the following findings is most likely?
A) Type A autoimmune gastritis
B) CagA positive H pylori
C) Low gastrin levels after a meal
D) Normal gastric acid production
E) Absence of gastric metaplasia in the duodenum

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