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
Which of the following is associated with suicide risk? 
Select and explain. 
A. Noradrenaline, B. Serotonin, C. GABA, D. Dopamine
B: Serotonin
Answer: B: Serotonin 
Explanation: Ans. B SerotoninLow concentrations of 5-hydroxyindoleacetic acid (5-HIAA- metabolite of serotonin) in CSF associated with higher suicide risk