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
Which of the following is most resistant to antiseptics? 
Select and explain. 
A. Spore, B. Prion, C. Cyst, D. Fungus
B: Prion
Answer: B: Prion 
Explanation: Resistance of organism to antiseptics in decreasing order is as follows:

Prions
Coccidia
Spores
Mycobacteria
Cysts
Small non-enveloped virus
Trophozoites
Gram-negative bacteria (non-sporulating)
Fungi
Large non-enveloped virus
Gram-positive bacteria
Lipid enveloped / medium sized virus (HIV, HBV)