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A 75-year-old man presents with 12 months history of cognitive impairment, parkinsonism, intermittent confusion and generalised myoclonus. He was started on 62.5 tds of sinemet. In the following 2 months, he was started experiencing visual hallucinations. The most likely diagnosis is:
1) Idiopathic Parkinson's disease
2) Alzheimer's disease
3) Diffuse Lewy body disease
4) Multiple system atrophy
5) Progressive supranuclear palsy
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