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': 'Which of the following is associated with suicide risk? \nSelect and explain. \nA. Noradrenaline, B. Serotonin, C. GABA, D. Dopamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B SerotoninLow concentrations of 5-hydroxyindoleacetic acid (5-HIAA- metabolite of serotonin) in CSF associated with higher suicide risk', 'role': 'assistant'}]