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
Vital capacity is: 
Select and explain. 
A. 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.
D: T.V. + I.R.V. + E.R.V.
Answer: D: T.V. + I.R.V. + E.R.V. 
Explanation: 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