## **Core Concept**
The "pink tooth of Mummery" refers to a clinical condition where a tooth appears pink due to the resorption of dentin and the subsequent exposure of the underlying pulp and blood vessels. This condition is named after the dentist who first described it.

## **Why the Correct Answer is Right**
The correct answer, **C.**, is related to the condition known as "pink tooth of Mummery," which is associated with **internal resorption** of the tooth. Internal resorption is a pathological process where the dentin of the tooth is resorbed from the inside, often due to pulp necrosis or chronic inflammation. This resorption can lead to the appearance of a pinkish hue through the tooth structure due to the visibility of the pulp and its blood vessels.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not relate to the specific condition of internal resorption or the appearance of a tooth due to such a process.
- **Option B:** Similarly, this option does not accurately describe or relate to the condition known as "pink tooth of Mummery."
- **Option D:** This option is also incorrect as it does not correspond with the clinical presentation or etiology of the "pink tooth of Mummery."

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the "pink tooth of Mummery" is a sign of **internal tooth resorption**, which can be detected radiographically as a radiolucent area within the tooth. Clinically, it presents as a pinkish discoloration of the tooth. Early detection is crucial for the management and possible preservation of the tooth.

## **Correct Answer:** . Internal resorption.