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
3.Rhinosporidiosis is caused by: 
Select and explain. 
A. Fungus, B. Virus, C. Bacteria, D. Protozoa
D: Protozoa
Answer: D: Protozoa 
Explanation: It has long been considered to be a fungus but it has been difficult to classify this organism. It has not been cultured so far. Some consider it to be a protozoa or a fish parasite belonging to DRIP clade (Dermocystidium, Rosette agent, Ichthyophonus and Psorospermum). Ref: Dhingra 7e pg 177.