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': 'The volume in lungs at the time of full relaxation of lungs is \nSelect and explain. \nA. FRC, B. Tidal volume, C. Inspiratory reserve volume, D. Expiratory reserve volume', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Functional residual capacity: Amount of air remaining in the lungs after a normal tidal expiration (RV + ERV). Around 2400 mlRef: Ganong review of medical physiology 23rd edition Page no: 593', 'role': 'assistant'}]