This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood disorders, Subject name: Psychiatry
[{'content': 'Most common mental disorder as a cause of suicide \nSelect and explain. \nA. Mania, B. Depression, C. Alcohol dependence, D. Schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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, depression(1major 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)', 'role': 'assistant'}]