Psychiatry 5-HIAA (Hydroxyindoleacetic Acid) is a metabilite of which of the following neurotransmitters? A Noradrenaline B Serotonin C GABA D Glutamine 💡 Explanation 5-HIAA (Hydroxyindoleacetic Acid) is a metabilite of which of the following neurotransmitters? ✓ Correct Answer: B. Serotonin