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
The neurotransmitter that is associated with suicidal tendencies is: 
Select and explain. 
A. Serotonin, B. GABA, C. Nor-epinephrine, D. Acetylcholine
A: Serotonin
Answer: A: Serotonin 
Explanation: A i.e. Serotonin