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': 'All are true regarding H.Pylori except - \nSelect and explain. \nA. Less prevalent in developing countries, B. Ulcer is caused by toxigenic strains, C. Urea breath +ve test is a rapid method of detection, D. Gram -ve organism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]