This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Gamma amino butyrate is synthesized from \nSelect and explain. \nA. Fumarate, B. Glutamate, C. Histidine, D. Glycine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gamma-aminobutyric acid or GABA is formed by decarboxylation of glutamate in presence of enzyme glutamate decarboxylase.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 224, Fig 17.2', 'role': 'assistant'}]