**Core Concept**
Dental cysts are pathologies that arise from the epithelial remnants surrounding an unerupted or impacted tooth. The most common type is the radicular cyst, which forms from the epithelial cells of the dental follicle. This cyst is a result of the inflammatory response to the pulp necrosis.

**Why the Correct Answer is Right**
The radicular cyst is the most common odontogenic cyst and is directly related to the unerupted tooth. The cyst forms due to the proliferation of the epithelial cells in the dental follicle in response to the irritants from the necrotic pulp. The radicular cyst is typically lined by a stratified squamous epithelium and is filled with a fluid or semi-solid content. The cyst formation is a result of the chronic inflammatory response to the pulp necrosis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not specify the type of cyst that arises from an unerupted tooth. While a periapical cyst can form from an unerupted tooth, it is not the most common type.
* **Option B:** This option is incorrect as it is a type of cyst that arises from the epithelial remnants of the salivary glands, not an unerupted tooth.
* **Option C:** This option is incorrect as it is a type of cyst that arises from the epithelial remnants of the nasolabial duct, not an unerupted tooth.

**Clinical Pearl / High-Yield Fact**
The radicular cyst is the most common odontogenic cyst and is usually associated with a non-vital tooth. It is essential to diagnose and treat the underlying cause of the cyst formation, which is the pulp necrosis. The treatment of choice is the removal of the unerupted tooth and the cyst lining.

**Correct Answer: D. Radicular cyst.