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
HIAA is a metabolite of - 
Select and explain. 
A. Serotonin, B. Dopamine, C. Epinephrine, D. Histamine
A: Serotonin
Answer: A: Serotonin 
Explanation: None