This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
[{'content': 'Which of the following is increased in elderly patients compared with their younger counterpas \nSelect and explain. \nA. Vital capacity, B. Ventilatory response to hypoxia or hypercarbia, C. Air trapping, D. Resting aerial oxygen tension (PaO2 )', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The propensity for air trapping is increased with age. In contrast, the vital capacity (A), aerial oxygen tension (C), and ventilatory response to hypoxia or hypocarbia are decreased with age.', 'role': 'assistant'}]