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': 'Glutamine synthetase is a \nSelect and explain. \nA. Isomerase, B. Ligase, C. Lyase, D. Transferase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ligases are enzymes that link two substrate together,usually with the simultaneous hydrolysis of ATP. Glutamine synthetase catalyses the amidation of glutamic acid to glutamine.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 49 and 224', 'role': 'assistant'}]