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 of the following is NOT a motile organism: September 2004 \nSelect and explain. \nA. Shigella, B. Treponema, C. Listeria, D. Pseudomonas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Shigella Shigellae are sho, Gram negative bacilli. They are non-motile, non-capsulated and non-sporing.', 'role': 'assistant'}]