This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
[{'content': 'At the end of normal expiration \nSelect and explain. \nA. The outward recoil tendency of the chest, B. The volume inside the lung is expiratory reserve volume, C. The chest wall has a tendency to move inwards, D. Alveolar pressure is usually negative', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The outward recoil tendency of the chest for inspirationRef: Ganong&;s Review of Medical Physiology; 24th edition; page no: 629', 'role': 'assistant'}]