## Core Concept
The question pertains to a method used in forensic odontology and anthropology to estimate the age of an individual based on dental characteristics. The incremental lines on the enamel of teeth are a key feature for age estimation.

## Why the Correct Answer is Right
The correct answer, **A. Attrition**, is not directly related to incremental lines but let's evaluate each option given. Incremental lines on enamel, specifically known as **Striae of Retzius**, are growth lines that appear as incremental lines or bands in the enamel. These lines are a result of the incremental growth of enamel and can be used to estimate the age of an individual at the time of tooth formation. The method that utilizes these lines for age estimation is indeed related to their periodic formation.

## Why Each Wrong Option is Incorrect
- **Option A: Attrition** - This refers to the wear and tear of teeth over time, which can also be used for age estimation but does not directly relate to incremental lines on enamel.
- **Option B: Lamina propria** - This term refers to a layer of connective tissue that supports epithelial layers, including those in the oral cavity, but is not directly related to incremental lines on enamel.
- **Option C: Incremental lines of Boyde** - While related to dental enamel, this option does not directly correspond with the commonly recognized method for age estimation using enamel lines.
- **Option D: Lines of Retzius** - This is the correct term for the incremental lines seen in enamel, which are indeed used for age estimation.

## Clinical Pearl / High-Yield Fact
A memorable point for exams is that **Lines of Retzius** are incremental growth lines in tooth enamel that can be used to estimate the age of an individual. These lines are formed due to the rhythmic activity of ameloblasts during enamel formation.

## Correct Answer Line
**Correct Answer: D. Lines of Retzius**.