This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Serotonin is: \nSelect and explain. \nA. 5 Hydroxy tryptophan, B. 5 Hydroxy tryptamine, C. 5 Carboxy tryptamine, D. 5 Carboxy tryptophan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. 5 Hydroxytryptamine5 Hydroxy Tryptophan is decarboxylated by Aromatic aminoacid decarboxylase to form 5 Hydroxytryptamine or Serotonin. Coenzyme is PLP.', 'role': 'assistant'}]