Which statement about tardive dyskinesia (TD) is true?

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Tardive dyskinesia (TD) is a neurological disorder characterized by repetitive, involuntary movements of the face, tongue, or other body parts. It occurs in about 20% to 30% of people treated with neuroleptic medications. The cause of TD is not well understood, but it may be linked to excess dopamine receptors or a D₁-D₂ receptor imbalance. The incidence of TD tends to increase with increasing age of patients. TD may persist even after drug treatment is stopped.

Which Statement About Tardive Dyskinesia (TD) Is True