Which of the following options is a correct indication for omeprazole (Prilosec)?

The correct answer is A because omeprazole is a proton pump inhibitor that helps reduce stomach acid production, making it effective in preventing peptic ulcers. Omeprazole works by blocking the final step of acid production in the stomach, thereby protecting the stomach lining from damage. Treating acute duodenal ulcers caused by H. pylori (Choice B) typically involves a combination of antibiotics and acid-reducing medications, not omeprazole alone. Omeprazole is not only used for heartburn relief (Choice C) but also for long-term management of conditions like GERD. While omeprazole can help with gastric ulcers caused by NSAIDs (Choice D), its primary indication is prevention of peptic ulcers.