<prompt> Suicide is most common in -DepressionAlcohol dependenceDementiaSchizophrenia  <response>: Ans. is a i.e., Depression CausesRisk factors for suicidePsychiatric disorders : - Depression most common, alcoholism 2nd me, DrugSubstance dependence, Schizophrenia, Dementia.Physical illness : - Cancer, AIDS, Multiple sclerosis, Head trauma.Psychosocial factors : - Failure in love, marital difficulties, family dispute, illegitimate pregnancy.Biological factors : - Decrease in serotoninOther - Male sex, Age 40 years, Single Unmarried, divorced or widowed, previous suicide attempt, social isolation. 