The clearance of drug means-
Ans. is 'a' i.e., Unit volume of plasma which is cleared off drug in a unit of time The clearance of a drug is the theoretical volume of plasma from which the drug is completely removed in unit time.
Unit volume of plasma which is cleared off drug in a unit of time
Amount of drug excreted in urine
Amout of drug metabolised in unit of time
All of the above