**Core Concept**
Anankastic personality disorder, also known as obsessive-compulsive personality disorder (OCPD), is characterized by a pervasive pattern of preoccupation with orderliness, perfectionism, and control. Individuals with OCPD exhibit a need for control, perfection, and rigidity, which can lead to difficulties in interpersonal relationships and daily functioning.

**Why the Correct Answer is Right**
The core features of anankastic personality disorder include a preoccupation with details, rules, and lists, as well as a tendency to be overly critical and perfectionistic. This is often accompanied by a need for control and orderliness, which can manifest as an excessive attention to detail, a tendency to hoard possessions, and an inability to delegate tasks. The pathophysiology of OCPD is not fully understood, but it is thought to involve abnormalities in brain regions involved in executive function, such as the prefrontal cortex.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a feature of anankastic personality disorder. While individuals with OCPD may exhibit some degree of anxiety, it is not a defining characteristic of the disorder.

**Option B:** This option is not a feature of anankastic personality disorder. Individuals with OCPD are not typically characterized by a lack of motivation or energy.

**Option C:** This option is not a feature of anankastic personality disorder. While individuals with OCPD may exhibit some degree of rigidity, it is not a defining characteristic of the disorder.

**Clinical Pearl / High-Yield Fact**
One key feature of anankastic personality disorder is the presence of a "need for control," which can manifest as an excessive attention to detail or a tendency to hoard possessions. This can be remembered using the mnemonic "NEED," which stands for "Need for control, Excessive attention to detail, Excessive perfectionism, and Difficulty delegating tasks."

**Correct Answer: D.**