(D) After a maximum expiration,the volume of air that still remains in the lungs is known as the Residual Volume $(RV)$.This volume of air cannot be e

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(D) After a maximum expiration,the volume of air that still remains in the lungs is known as the Residual Volume $(RV)$.This volume of air cannot be exhaled even by a forceful expiration.It helps in preventing the collapse of the alveoli during expiration.Therefore,the correct option is $D$.