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
The antiepileptic drug which does not produce enzyme induction is : 
Select and explain. 
A. Phenobarbitone, B. Sodium valproate, C. Phenytoin sodium, D. Carbamazepine
B: Sodium valproate
Answer: B: Sodium valproate 
Explanation: None