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: Microbiology
[{'content': 'A 34 year old man diagnosed of having H. pylori infection after biopsy. Where can H. pylori be found in the stomach? \nSelect and explain. \nA. Epithelial lining, B. Mucous layer, C. Lamina propria, D. Local toxins', 'role': 'user'}, {'content': "Answer: B \nExplanation: H. pylori is a noninvasive organism that colonizes the mucous layeroverlying gastric epithelium. Factors impoant in the organism's ability to colonize the stomach include its flagellae, which facilitate its locomotion; its ability to adhere to the mucous layer; and its production of urease.", 'role': 'assistant'}]