**Core Concept**
Pseudodementia refers to a reversible cognitive impairment that mimics dementia, often seen in patients with underlying psychological issues.

**Why the Correct Answer is Right**
Pseudodementia is commonly associated with depression, particularly in elderly patients. The cognitive symptoms of depression, such as apathy, lack of motivation, and difficulty concentrating, can be mistaken for dementia. This condition is thought to result from the neurovegetative symptoms of depression, including sleep disturbances, decreased appetite, and fatigue, which can impair cognitive function. The cognitive impairment in pseudodementia typically improves with treatment of the underlying depression.

**Why Each Wrong Option is Incorrect**
**Option A:** While anxiety disorders can have cognitive symptoms, pseudodementia is not typically associated with anxiety.
**Option B:** Dementia is a distinct clinical entity characterized by irreversible cognitive decline, in contrast to pseudodementia, which is reversible.
**Option C:** Schizophrenia can have cognitive symptoms, but pseudodementia is not a characteristic feature of this disorder.

**Clinical Pearl / High-Yield Fact**
Pseudodementia should be considered in any elderly patient presenting with cognitive impairment, especially if there are depressive symptoms or a recent change in mental status. A thorough psychiatric evaluation is essential to distinguish pseudodementia from dementia.

**Correct Answer: D. Depression.**