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
Increase in suicidal behavior is due to - 
Select and explain. 
A. Increase in serotonin, B. Decrease in serotonin, C. Increase in nor-adrenaline, D. Reactive depression
B: Decrease in serotonin
Answer: B: Decrease in serotonin 
Explanation: Patient with suicide has decreased level of serotonin metabolite (5-HIAA) in urine & plasma.