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
Serotonin is: 
Select and explain. 
A. 5 Hydroxy tryptophan, B. 5 Hydroxy tryptamine, C. 5 Carboxy tryptamine, D. 5 Carboxy tryptophan
B: 5 Hydroxy tryptamine
Answer: B: 5 Hydroxy tryptamine 
Explanation: Ans. B. 5 Hydroxytryptamine5 Hydroxy Tryptophan is decarboxylated by Aromatic aminoacid decarboxylase to form 5 Hydroxytryptamine or Serotonin. Coenzyme is PLP.