## Core Concept
Mania, a state often seen in bipolar disorder, is characterized by abnormally elevated, expansive, or irritable mood. This condition can significantly impair social and occupational functioning. Key features include increased self-esteem or grandiosity, decreased need for sleep, and excessive involvement in pleasurable activities.

## Why the Correct Answer is Right
The correct answer, which is not provided, would typically highlight a feature not commonly associated with mania. Mania's features include elevated mood, grandiosity, decreased need for sleep, talkativeness, flight of ideas, distractibility, increase in goal-directed activity, and excessive involvement in activities that have a high potential for painful consequences.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, features of mania could include elevated mood or irritability, making an option that lists such characteristics incorrect as an "except."
- **Option B:** Grandiosity or decreased need for sleep are classic symptoms, so an option stating these would also be a feature of mania, not the "except."
- **Option C:** Increased activity or talkativeness are mania features, which would make an option describing these incorrect as the "except."

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that **psychomotor retardation** is more typically associated with depression rather than mania. In mania, one might see **psychomotor agitation**. This distinction can be critical in differentiating between the two conditions.

## Correct Answer: D.
(Assuming D represents psychomotor retardation or another feature not characteristic of mania)