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': 'Microaerophilic bacteria: \nSelect and explain. \nA. Campylobacter, B. Vibrio cholera, C. Pseudomonas, D. Salmonella', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Campylobacter Microaerophilic organism are organisms that require oxygen to survive, but in concentration less than that present in atmosphere, i.e. less than 21%. Example include: - Treponema pallidum - Helicobacter pylori - Borrelia burgdorferi - Campylobacter', 'role': 'assistant'}]