This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Abuse, Subject name: Psychiatry
Risk factor for suicide is? 
Select and explain. 
A. Increased serotonin, B. Drug abuse, C. Female sex, D. Married person
B: Drug abuse
Answer: B: Drug abuse 
Explanation: Ans. is 'b' i.e., Drug abuse Causes/Risk factors for suicideA. Psychiatric disorders: - Depression (most common), alcoholism (2nd me), Drug/Substance dependence, Schizophrenia, Dementia.B. Physical illness: - Cancer, AIDS, Multiple sclerosis, Head trauma.C. Psychosocial factors: - Failure in love, marital difficulties, family dispute, illegitimate pregnancy.D. Biological factors: - Decrease in serotoninE. Other - Male sex, Age > 40 years, Single (Unmarried, divorced or widowed), previous suicide attempt, social isolation.