This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Psychiatry
[{'content': 'Parkinsonism differ from atypical parkinsonism by the absence of \nSelect and explain. \nA. Resting tremor, B. Postural instability, C. Veical gaze palsy, D. Gait abnormality', 'role': 'user'}, {'content': "Answer: A \nExplanation: Atypical Parkinsonisms Characterised by Progressive supranuclear palsy Coicobasal ganglionic degeneration Frontotemporal dementia Multiple-system atrophy a)Cerebellar type (MSA-c) b)Parkinson type (MSA-p) Poor response to dopamine early loss of balance prominent intellectual changes rapid onset of progression conspicuous postural hypotension urinary & bowel incontinence Little or no tremor Reference: Chapter 372. Parkinson's Disease and Other Movement Disorders Harrison's Principles of Internal Medicine 18th edition", 'role': 'assistant'}]