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': 'Vital capacity is: \nSelect and explain. \nA. Tidal volume + Expiratory Reserve Volume, B. Tidal volume + Inspiratory Reserve Volume, C. I.R.V. + E. R.V., D. T.V. + I.R.V. + E.R.V.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. T.V. + I.R.V. + E.R.V.Lungs capacitiesVC=IRV+TV+ERVIC=IRV+TVVC=IC+ERVFRC=ERV+RV(b)TLC=IRV+TV+ERV+RVor =IC+FRVor =VC+RVFig.: Diagram showing respiratory excursions during normal breathing and during maximal inspiration and maximal expiration', 'role': 'assistant'}]