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
All of the followoing non-mycobacterial microorganisms display acid fastness, EXCEPT: 
Select and explain. 
A. Nocardia, B. Fusobacterium nucleatum, C. Rhodococcus, D. Isospora
B: Fusobacterium nucleatum
Answer: B: Fusobacterium nucleatum 
Explanation: 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