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: Medicine
[{'content': 'All of the followoing non-mycobacterial microorganisms display acid fastness, EXCEPT: \nSelect and explain. \nA. Nocardia, B. Fusobacterium nucleatum, C. Rhodococcus, D. Isospora', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Microorganisms other than mycobacteria that display some acid fastness includes Nocardia, Rhodococcus, Legionella micdadei, Protozoa Isospora and Cryptosporidium. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 1340', 'role': 'assistant'}]