The clearance of drug means-
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
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.