Tidal volume and inspiratory reserve volume (TV+IRV) are together called as
Inspiratory Capacity (IC)
Vital Capacity (VC)
Functional Residual Capacity (FRC)
Total Lung Capacity (TLC)
Pulmonary Capacities -
By adding up a few respiratory volumes described in the previous concept, one can derive various pulmonary capacities, which can be used in clinical diagnosis.
Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume (TV+IRV).
Hence, the correct option is a. Inspiratory capacity