<prompt> Intense nihilism, somatization and agitation in old age are the hallmark symptoms of -Involutional melancholiaAtypical depressionSomatized depressionDepressive stupor  <response>: Involutional melanocholia has following featursi Involutional old age groupii Melanocholia multiple somatic symptoms somatizationiii Psychomotor agitation Retardationiv Psychotic features delusion of nilism, guilt, perseution, Hypochondriacal; Hallucinations.Atypical depression is characterized by increased appetite increased weight, increased sleep hypersomnia, Lethargy, Rejection sensitivity.For somatized depression see a previous explanation.Depressive stupor occurs in the severe depression where the person is akinetic immobile and mute. 