Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. the existence of a bacterial infection in the stomachs of most patients with ulcers
B. genetically predetermined weakness in the walls of the intestinal tract
C. the eroding effect of certain spicy foods on the lining of the esophagus
D. greater acid concentrations in the stomach, lower esophagus, and duodenum
Answer: A
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