text: On brain CT scan, Parkinson disease is characterized by cortical and subcortical atrophy.
option_0: Parkinson's disease CT
option_1: Dementia MRI
option_2: Alzheimer's disease MRI
option_3: Parkinson's disease MRI
option_4: Alzheimer's disease ultrasound
option_5: Alzheimer's disease CT scan
option_6: Dementia CT
option_7: Alzheimer's disease electrocardiogram