Explanation:

- Option 1: Medical insanity

- Relates to disorders diagnosed by mental health professionals.

- Not directly used in legal contexts to determine criminal responsibility.

- Option 2: Legal insanity

- Pertains to inability to understand the nature of an act or that it is wrong due to unsound mind at the time of the act.

- Correct Answer: Section 84 IPC covers legal insanity.

- Option 3: Moral insanity

- Refers to abnormal behavior or lack of moral judgment without cognitive deficits.

- Not recognized in legal terms for criminal acts in IPC.

- Option 4: Unsoundness of mind of any kind

- General term for mental conditions but not specific to legal context for defense under IPC.

?? Summary: Section 84 deals with legal insanity as a defense in criminal law.

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