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': 'The increased suicidal tendency is associated with - \nSelect and explain. \nA. Noraderenaline, B. Serotonin, C. Dopamine, D. GABA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Patient with suicide has decreased level of serotonin metabolite (5-HIAA) in urine & plasma.', 'role': 'assistant'}]