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 agent does not act via Na+ channel modulation ? 
Select and explain. 
A. Vigabatrin, B. Phenytoin, C. Valproate, D. Lamotrigine
A: Vigabatrin
Answer: A: Vigabatrin 
Explanation: None