**Core Concept**
Rhinosporidiosis is a chronic granulomatous infection caused by Rhinosporidium seeberi, characterized by the formation of polypoid masses in the nasal mucosa, conjunctiva, or other parts of the body. The disease primarily affects the mucous membranes, leading to the development of lesions that can cause discomfort, bleeding, and other symptoms.

**Why the Correct Answer is Right**
The most common presentation of adult rhinosporidiosis is a nasal polypoid mass, typically occurring in the nasal septum or lateral wall. This is due to the organism's predilection for the mucous membranes, where it forms characteristic globi, which are aggregates of spores surrounded by a cyst wall. The globi are thought to be responsible for the disease's clinical manifestations, including bleeding, nasal discharge, and respiratory obstruction.

**Why Each Wrong Option is Incorrect**
**Option A:** Rhinosporidiosis can also affect the conjunctiva and other parts of the body, but the nasal form is the most common presentation.
**Option B:** Rhinosporidium seeberi is not a fungus, but a protistan parasite that causes the disease.
**Option C:** While rhinosporidiosis can cause nasal polyps, the term "nasal polyp" is not specific to this disease and can be caused by other conditions.

**Clinical Pearl / High-Yield Fact**
Rhinosporidiosis is a rare disease that can be challenging to diagnose, but it is often associated with a history of repeated nasal polyps or bleeding.

**Correct Answer:** C. Nasal polypoid mass.