**Core Concept**
Pseudo-dementia, also known as subcortical dementia, is a clinical syndrome characterized by cognitive impairment that mimics dementia but lacks the characteristic neuropathological features of dementia. This condition is often associated with psychiatric or medical conditions that affect the brain's subcortical structures.

**Why the Correct Answer is Right**
Pseudo-dementia is commonly seen in patients with depression, particularly those with melancholic features or psychotic depression. The cognitive impairment in pseudo-dementia is thought to result from the disruption of subcortical structures, including the basal ganglia and thalamus, which are involved in mood regulation and cognitive processing. The pathophysiology of pseudo-dementia involves altered neurotransmitter levels, including decreased dopamine and serotonin, which contribute to the cognitive and affective symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because pseudo-dementia is not typically associated with primary psychiatric conditions such as schizophrenia or bipolar disorder, which are characterized by distinct cognitive and psychotic symptoms.
**Option B:** This option is incorrect because pseudo-dementia is not a feature of normal pressure hydrocephalus (NPH), which presents with a classic triad of gait disturbance, dementia, and urinary incontinence.
**Option C:** This option is incorrect because pseudo-dementia is not a characteristic of frontotemporal dementia (FTD), which is a group of neurodegenerative disorders that primarily affect the frontal and temporal lobes.

**Clinical Pearl / High-Yield Fact**
Pseudo-dementia can be distinguished from true dementia by the presence of reversible cognitive symptoms, particularly in patients with depression or other psychiatric conditions. A thorough psychiatric evaluation and cognitive assessment are essential to diagnose pseudo-dementia accurately.

**Correct Answer:** D.