Question: A 76-year-old man consulted for cognitive deterioration, slowness and awkwardness of movements, of eight months of evolution. The family reported that the patient had visual hallucinations, so his Primary Care physician prescribed low doses of risperidone, with a significant worsening of motor status. In view of these data, what is the most likely diagnosis? 
 Options:  <1> Alzheimer disease. <2> Dementia due to Lewy bodies. <3> Frontotemporal dementia. <4> Vascular dementia <5> Occasional Creutzfeldt-Jakob disease.
2