A 38-Year-Old Woman Visits the Physician Because of Uncontrolled Movements

A 38-year-old woman visits the physician because of uncontrolled movements of the arms, legs, head, face, and upper body. These symptoms have increased progressively over the past 12 months. She is also depressed and irritable, and she repeats the same question six times during the 30-minute office visit. Gene analyses show expansion of a CAG triplet repeat on chromosome 4. Use this information to answer the next two questions.
-Which of the following is the most likely diagnosis?

A) Alzheimer disease
B) Bipolar disorder
C) Brain tumor
D) Huntington disease
E) Parkinson disease