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 Term Clearance of drug means: \nSelect and explain. \nA. Unit volume of plasma which is cleared off drug in unit of time, B. Amount of drug excreted in urine, C. Amount of drug metabolised in unit of time, D. Fraction of dose administered only', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Unit volume of plasma which is cleared off drug in unit of time', 'role': 'assistant'}]