This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
[{'content': 'AH of the following are true about H. pylori EXCEPT \nSelect and explain. \nA. Maximum concentration is in gastric pit, B. Urease breath test is sensitive, C. Gram negative spiral rod, D. Blood group A is more susceptible', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Maximum concentration is in gastric pit# H. pylori is a Gram-negative spiral rod, motile by a unipolar tuft of lopotrichous flagella.> The bacteria are present only in the overlying mucus & do not invade the mucosa. Gastric antrum is the commonest site of colonization, though any part of the stomach may be involved.', 'role': 'assistant'}]