This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
The antiepileptic Drugs Which does not produce enzymes induction is: 
Select and explain. 
A. Phenobarbitone, B. Sodium valproate, C. Phenytoin sodium, D. Carbamazepine
B: Sodium valproate
Answer: B: Sodium valproate 
Explanation: Ref: KDT 6/e p27,408 Most anticonvulsants are enzyme inducers except valproate (inhibitor).