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 is followed by all the drugs except 
Select and explain. 
A. Phenytoin, B. Barbiturates, C. Alcohol, D. Theoplylline
B: Barbiturates
Answer: B: Barbiturates 
Explanation: A barbiturate is a drug that acts as a central nervous system depressant, and can therefore produce a wide range of effects, from mild sedation to death . The kinetics of barbiturate elimination are mixed: first order at low concentrations and zero order at high ones Ref-6/e p31