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
Which of the following antiepileptic drugs acts by affecting the levels of GABA ? 
Select and explain. 
A. Sodium valproate, B. Ethosuximide, C. Phenytoin sodium, D. Carbamazepine
A: Sodium valproate
Answer: A: Sodium valproate 
Explanation: None