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': 'Which one of the following enteric organisms is anaerogenic and non motile? \nSelect and explain. \nA. Shigella sonnei, B. Salmonella typhi, C. Proteus mirabilis, D. Klebsiella pneumonia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]