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 of the following are acid fast bacteria except: \nSelect and explain. \nA. Cryptosporidia, B. Mycoplasma, C. Mycobacteria, D. Nocardia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., Mycoplasma", 'role': 'assistant'}]