**Core Concept**
Rhinolith is a rare condition characterized by the formation of a stone within the nasal cavity, often as a result of calcification of a foreign body or an abnormal growth. The calcification process involves the deposition of calcium salts onto a nucleus, which can be a variety of objects, including coins, beads, or even a surgical sponge.

**Why the Correct Answer is Right**
The formation of a rhinolith can lead to a range of complications, including nasal obstruction, sinusitis, and epistaxis. The calcification process can also cause irritation and inflammation of the surrounding nasal mucosa, leading to symptoms such as nasal discharge, congestion, and facial pain. In severe cases, a rhinolith can cause a nasal septal abscess or perforation.

**Why Each Wrong Option is Incorrect**
**Option A:** While rhinoliths can cause nasal obstruction, this is not the most significant or specific consequence.
**Option B:** Although rhinoliths can be associated with sinusitis, this is not the most direct or common complication.
**Option C:** Rhinoliths are not typically associated with epiglottitis.

**Clinical Pearl / High-Yield Fact**
A rhinolith can be diagnosed on imaging studies, such as a CT or MRI scan, and may appear as a calcified mass within the nasal cavity. It is essential to consider rhinolith in the differential diagnosis of nasal obstruction or chronic sinusitis, particularly in patients with a history of nasal trauma or foreign body insertion.

**Correct Answer:** C.