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
[{'content': 'Which of the following antiepileptic agent does not act via Na+ channel modulation ? \nSelect and explain. \nA. Vigabatrin, B. Phenytoin, C. Valproate, D. Lamotrigine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]