## Core Concept
The Kanawati index is a measure used in forensic anthropology to estimate the post-mortem interval (PMI), which is the time elapsed since death. It is specifically related to the changes in the eye, particularly the degree of eye lens opacity.

## Why the Correct Answer is Right
The Kanawati index is utilized to assess the degree of eye lens opacity as a means to estimate the post-mortem interval. This method involves measuring the lens opacity and correlating it with the time since death. The index provides a way to standardize this assessment, making it a useful tool in forensic investigations.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately represent the Kanawati index.
- **Option B:** This option is incorrect because it does not relate to the definition or application of the Kanawati index.
- **Option D:** This option is incorrect because it is not associated with the Kanawati index.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the Kanawati index is specifically related to changes in the eye lens and is used for estimating the post-mortem interval. This method can be useful in forensic pathology but must be used in conjunction with other evidence and methods for accurate estimation.

**Correct Answer: C.**