A 52-year-old man from Delhi presents with a 6-month history of epigastric pain, heartburn, and nausea. Upper endoscopy reveals a 2 cm ulcer in the gastric antrum with surrounding erythema. Rapid urease test is positive. He denies NSAID use. His serum gastrin level is 85 pg/mL (normal <100). What is the most appropriate next step in management?

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