<prompt> Most common mental disorder as a cause of suicideManiaDepressionAlcohol dependenceSchizophrenia  <response>: Suicide is a model of psychiatric emergencies and is also the commonest cause of death among the psychiatric patient;s psychiatric disorders are a major cause of suicide, for example, depression1major depression 2depression secondary to a serious physical illness 3reactive depression, alcoholism and drug dependence and schizophrenia Ref: a sho textbook of psychiatry, Niraj Ahuja, 7th edition, pg no.222 