This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The clearance of drug means- \nSelect and explain. \nA. Unit volume of plasma which is cleared off drug in a unit of time, B. Amount of drug excreted in urine, C. Amout of drug metabolised in unit of time, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]