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: Physiology
[{'content': 'The normal respiratory quotient for carbohydrates is \nSelect and explain. \nA. 0.5, B. 0.75, C. 0.8, D. 1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: “Respiratory Quotient” Is the Ratio of CO2\xa0 Production to O2\xa0Utilization and Can Be Used to Estimate Fat and Carbohydrate Utilization.\xa0 When carbohydrates are metabolized with oxygen, exactly one carbon dioxide molecule is formed for each molecule of oxygen consumed. This ratio of carbon dioxide\xa0output to oxygen usage is called the respiratory quotient, so\xa0the respiratory quotient for carbohydrates is 1.0.', 'role': 'assistant'}]