**Core Concept**
The **Listing's Reduced Eye** is a simplified model of the human eye, used to understand its optical properties. It is based on the concept of reducing the complex structure of the eye into a single, equivalent refracting surface. The **nodal point** is a critical reference point in this model, representing the center of the eye's optical system.

**Why the Correct Answer is Right**
The distance between the nodal point and the cornea is a fundamental parameter in the Listing's Reduced Eye model, essential for calculating the eye's optical power and understanding its refractive properties. This distance is typically considered to be around 7.2 mm, although the exact value may vary slightly depending on the specific model or reference used.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not match the established value for the distance between the nodal point and the cornea in the Listing's Reduced Eye model.
**Option B:** This option is also incorrect, as it does not correspond to the commonly accepted measurement.
**Option D:** Similarly, this option is incorrect, as it does not align with the standard value used in the model.

**Clinical Pearl / High-Yield Fact**
The Listing's Reduced Eye model is a valuable tool for understanding the optical properties of the human eye, and its parameters, such as the distance between the nodal point and the cornea, are essential for calculating the eye's refractive power and designing corrective lenses.

**Correct Answer:** Correct Answer: C. 7.2 mm