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The defining feature of Trichotillomania is indeed chronic hair pulling. This psychological condition is characterized by an irresistible urge to pull out one’s hair, which can lead to noticeable hair loss and significant distress or impairment in functioning. Individuals may pull hair from various parts of their body, including the scalp, eyebrows, and eyelashes, and often engage in this behavior as a way to cope with anxiety, stress, or negative emotions.

The other choices describe conditions or behaviors that are not related to Trichotillomania. Frequent bed wetting pertains to enuresis, grandiosity and self-absorption are characteristics commonly associated with narcissistic personality disorder, and urine voiding does not provide any relevant context for understanding hair pulling disorders. Thus, chronic hair pulling distinctly identifies Trichotillomania as a unique mental health issue.