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
True statement about first order kinetics is: 
Select and explain. 
A. A constant amount of a drug is eliminated in unit time, B. The half-life increases with an increase in dose, C. The rate of elimination is constant, D. The rate of elimination is proportional to the plasma concentration
D: The rate of elimination is proportional to the plasma concentration
Answer: D: The rate of elimination is proportional to the plasma concentration 
Explanation: Drugs may follow zero order or first order kinetics. It depends on the following formula:
Rate of Elimination α {Plasma Concentration}order

Thus, if a drug follows zero order kinetics, {Plasma Concentration}0 is equal to one, in other words rate of elimination is independent of plasma concentration or rate of elimination is constant.
From the above formula, rate of elimination is proportional to plasma concentration for the drugs following first order kinetics.