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: ENT
Rhinosporidiosis is caused by- 
Select and explain. 
A. Fungus, B. Virus, C. Bacteria, D. Protozoa
D: Protozoa
Answer: D: Protozoa 
Explanation: Rhinosporidiosis is a disease caused by the organism Rhinosporidium seeberi, which was once thought to be a fungus but is now believed to be a rare aquatic protistan parasite of fish. First described in 1900 by Guillermo Seeber, it generally presents as swollen, pink or red polyps in the nasal cavity or the ocular conjunctivae. Other sites of infection are rare.