This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'The chances of a gastric carcinoma are not increased in: \nSelect and explain. \nA. Pernicious anemia, B. Atrophic gastritis, C. Achlorhydria, D. Duodenal ulcer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]