## Core Concept
The rules of insanity, also known as the M'Naghten rules, are a set of legal criteria used to determine whether a person can be held criminally responsible for their actions. These rules primarily focus on the cognitive aspect of insanity, specifically whether the individual knew the nature and quality of their actions and whether they knew what they were doing was wrong.

## Why the Correct Answer is Right
The M'Naghten rules, established in 1843, are a landmark in the insanity defense. They state that to establish a defense on the ground of insanity, it must be clearly proved that, at the time of committing the act, the party accused was laboring under such a defect of reason, from disease of the mind, as not to know the nature and quality of the act he was doing; or if he did know it, that he did not know he was doing what was wrong. This focuses on the lack of understanding of the act or its wrongfulness due to a mental disease.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, so we cannot assess its accuracy.
- **Option B:** This option is also not provided, making it impossible to evaluate.
- **Option C:** Similarly, without the content of Option C, we cannot determine its correctness.
- **Option D:** Again, the details of Option D are not given, so its assessment is not feasible.

## Clinical Pearl / High-Yield Fact
A key clinical pearl related to the insanity defense and the M'Naghten rules is that they primarily focus on the cognitive aspect of mental illness at the time of the crime, rather than the defendant's emotional state or potential for rehabilitation. This is crucial for forensic psychiatry and legal proceedings.

## Correct Answer: D.