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 cause of suicide is \nSelect and explain. \nA. Schizophrenia, B. Depression, C. Cyclothymia, D. Mania', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Depression is the most common cause of suicide Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 604-607', 'role': 'assistant'}]