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: Medicine
[{'content': 'Which of the following is a risk factor for Helicobacter pylori infection? \nSelect and explain. \nA. excess exposure to antibiotics, B. female sex, C. alpha 1-antitrypsin deficiency, D. low socioeconomic indicators', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Infection usually occurs early in life and is related to classic socioeconomic indicators such as poverty, domestic crowding, unsanitary living conditions, and unclean water. It is much more common in developing countries.', 'role': 'assistant'}]