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 is not a fungus ? 
Select and explain. 
A. Rhinosporidiosis, B. Sporotrichosis, C. Torulosis, D. Candidiasis
A: Rhinosporidiosis
Answer: A: Rhinosporidiosis 
Explanation: Ans. is 'a' i.e., Rhinospororidiosis . Rhinosporidium Seeberi is not a fungus. "Molecular studies have shown that the organism is not a fungus, but a primitive aquatic bacterium". - Greenwood "By using molecular tools, recently it has been found that R. seeberi is not a fungus but an unusual protist shares phylogenetic features with microbes that cause infection in fish" . Torulosis is a fungal infection caused by crptococcus neoformans which primarily affects CNS and lung.