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 an acid-fast bacillus \nSelect and explain. \nA. Mycobacterium bacilli, B. Treponema pallidum, C. Neisseria gonorrhea, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]