This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Major Depression, Subject name: Psychiatry
[{'content': 'Increased suicidal tendency is associated with - \nSelect and explain. \nA. Increased Noraderenaline, B. Decreased Serotonin, C. Decreased Dopamine, D. Increased GABA', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Decreased Serotonin o Patient with suicide has decreased level of serotonin metabolite (5-HIAA) in urine & plasma. Thus indirectly we can say that suicide is associated wdth decreased levels of serotonin and hence there is a decrease in the level o^ serotonin metabolites.", 'role': 'assistant'}]