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
[{'content': 'HIAA is a metabolite of - \nSelect and explain. \nA. Serotonin, B. Dopamine, C. Epinephrine, D. Histamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]