The clearance of drug means
Clearance of a substance is the volume of plasma cleared of the substance in unit time ie in one minute. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 353)
Volume of plasma which is cleared of drug in unit of time
Amount of drug excreted in urine
Amount of drug metabolized in unit of time
All of the above
General physiology