This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
With reference to duodenal ulcers, consider the following statements 
Select and explain. 
A. They occur most often in the second pa of duodenum, B. Infection with H. pylori and NSAID-induced injury account for majority of duodenal ulcer, C. Malignant duodenal ulcers are extremely rare, D. Extradication of H. pylori has greatly reduced the recurrence rates in doudenal ulcers
B: Infection with H. pylori and NSAID-induced injury account for majority of duodenal ulcer
Answer: B: Infection with H. pylori and NSAID-induced injury account for majority of duodenal ulcer 
Explanation: 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