This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Rhinosporidiosis is caused by which of the following? 
Select and explain. 
A. Fungus, B. Virus, C. Bacteria, D. Protozoa
D: Protozoa
Answer: D: Protozoa 
Explanation: Rhinosporidiosis is caused by Rhinosporidium seeberi. This organism was previously considered to be a fungus. It is now identified to be an aquatic protistan protozoa parasite belonging to the class Mesomycetzoea. ( Ref Scott Brown, 8th edition, VOL 1, Pg no. 208 )