## Core Concept
The detection of substances in burnt bones is crucial in forensic science, particularly in identifying victims and analyzing the circumstances of death. Burnt bones can still retain certain chemical and physical properties that can be analyzed. The question pertains to the identification of a substance that can be detected in burnt bones.

## Why the Correct Answer is Right
The correct answer, **D. DNA**, is right because DNA can be extracted and analyzed from burnt bones, although the process can be challenging due to the degradation of DNA when exposed to high temperatures. However, with advanced techniques, DNA analysis has become a valuable tool in forensic science for identifying human remains, even when they have been severely damaged.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because while certain physical characteristics might still be observable in burnt bones, the question seems to focus on a more specific, scientifically analyzable substance or property.
- **Option B:** This option is incorrect as it is not specified, but typically, burnt bones might not retain substances like drugs or alcohol in a detectable form due to the high temperatures involved.
- **Option C:** This option is incorrect because, similar to Option B, without specification, it's hard to assess, but generally, the focus in burnt bones is on DNA analysis for identification purposes.

## Clinical Pearl / High-Yield Fact
A crucial point to remember is that **DNA analysis from burnt bones** can be a powerful tool in forensic investigations. The process involves careful collection, extraction, and analysis of DNA, which can help in identifying victims of mass disasters or crimes. High temperatures can degrade DNA, but it can still be recovered and analyzed with modern techniques.

## Correct Answer: D. DNA.