<prompt> The clearance of drug means-Unit volume of plasma which is cleared off drug in a unit of timeAmount of drug excreted in urineAmout of drug metabolised in unit of timeAll of the above  <response>: 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. 