This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Zero order kinetics means 
Select and explain. 
A. A constant amount of drug is eliminated per unit time, B. A constant fraction of the drug in the body is eliminated per unit time, C. The fraction of the administrative dose that reaches the systematic circulation, D. None
A: A constant amount of drug is eliminated per unit time
Answer: A: A constant amount of drug is eliminated per unit time 
Explanation: Zero order of kinetics means a constant amount of drug is eliminated per unit time Ref -KDT 6/e p31