<prompt> Vascular dementia is characterised by all exceptVisual hallucinationMemory deficitEmotional liabilityNone of the above  <response>: Dementia is a chronic organic mental disorder, characterized by the following main clinical features: 1. Impairment of intellectual functions, 2. Impairment of memory predominantly of recent memory, especially in early stages, 3. Deterioration of personality with lack of personal care. Reference: A sho textbook of Psychiatry by Niraj Ahuja, page no.22. 