This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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: Psychiatric disorders are the most common cause of suicide. Depression is the most common cause followed by alcoholism.', 'role': 'assistant'}]