<prompt> With reference to duodenal ulcers, consider the following statementsThey occur most often in the second pa of duodenumInfection with H. pylori and NSAID-induced injury account for majority of duodenal ulcerMalignant duodenal ulcers are extremely rareExtradication of H. pylori has greatly reduced the recurrence rates in doudenal ulcers  <response>: H pylori infection constitutes 90 of developing a duodenal ulcer, also NSAIDs also causes the development of duodenal ulcer, ulcer occurs in the first pa of the duodenum usually within the first inch involving muscular layer , gastric metaplasia leads to the development of gastric carcinoma, anti-H.pylori regime is also useful in eradication Reference : SRB edition:5 page: 825,826,827 