This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Glutamine in blood acts as \nSelect and explain. \nA. NH3 transporter, B. Toxic element, C. Store energy, D. Abnormal metabolite', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Glutamine is the major transport form of ammonia.', 'role': 'assistant'}]