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Select the best answer.
a. duodenal ulcer
b. gastric ulcer
c. Zollinger Ellison syndrome
d. Zenker™s diverticula
30. severe refractory peptic ulcer disease, elevated serum gastrin
31. most common type of peptic ulcer
32. increased risk of cancer

30-c
31-a
32-b

30...c

31....a

32...b?